16040040 has 64 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 4253952.

The previous prime is 16039963. The next prime is 16040053. The reversal of 16040040 is 4004061.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41689 + ... + 42071.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^16040040 is an apocalyptic number.

16040040 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 16040040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24192000).

16040040 is an abundant number, since it is smaller than the sum of its proper divisors (32343960).

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

16040040 is a wasteful number, since it uses less digits than its factorization.

16040040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 16040040 is about 4005.0018726587. The cubic root of 16040040 is about 252.1942317116.

Subtracting from 16040040 its sum of digits (15), we obtain a square (16040025 = 4005²).

The spelling of 16040040 in words is "sixteen million, forty thousand, forty".