16231540 has 48 divisors (see below), whose sum is σ = 37029888. Its totient is φ = 5940864.

The previous prime is 16231513. The next prime is 16231543. The reversal of 16231540 is 4513261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16231543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42189 + ... + 42571.

It is an arithmetic number, because the mean of its divisors is an integer number (771456).

Almost surely, 2^16231540 is an apocalyptic number.

16231540 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 16231540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18514944).

16231540 is an abundant number, since it is smaller than the sum of its proper divisors (20798348).

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

16231540 is a wasteful number, since it uses less digits than its factorization.

16231540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16231540 is about 4028.8385423097. The cubic root of 16231540 is about 253.1939021897.

The spelling of 16231540 in words is "sixteen million, two hundred thirty-one thousand, five hundred forty".