16140240 has 120 divisors (see below), whose sum is σ = 56145960. Its totient is φ = 4150272.

The previous prime is 16140221. The next prime is 16140247. The reversal of 16140240 is 4204161.

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 16064064 = 276^2 + 4008^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16140247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20494 + ... + 21266.

It is an arithmetic number, because the mean of its divisors is an integer number (467883).

Almost surely, 2^16140240 is an apocalyptic number.

16140240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28072980).

16140240 is an abundant number, since it is smaller than the sum of its proper divisors (40005720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16140240 is a wasteful number, since it uses less digits than its factorization.

16140240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 16140240 is about 4017.4917548142. The cubic root of 16140240 is about 252.7182832875.

It can be divided in two parts, 161 and 40240, that added together give a square (40401 = 201²).

The spelling of 16140240 in words is "sixteen million, one hundred forty thousand, two hundred forty".