16043640 has 32 divisors (see below), whose sum is σ = 48131280. Its totient is φ = 4278272.

The previous prime is 16043639. The next prime is 16043663. The reversal of 16043640 is 4634061.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 16043640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66729 + ... + 66968.

Almost surely, 2^16043640 is an apocalyptic number.

16043640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16043640 is an abundant number, since it is smaller than the sum of its proper divisors (32087640).

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

16043640 is a wasteful number, since it uses less digits than its factorization.

16043640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133711 (or 133707 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 16043640 is about 4005.4512854359. The cubic root of 16043640 is about 252.2130976521.

The spelling of 16043640 in words is "sixteen million, forty-three thousand, six hundred forty".