16640440 has 16 divisors (see below), whose sum is σ = 37441080. Its totient is φ = 6656160.

The previous prime is 16640413. The next prime is 16640453. The reversal of 16640440 is 4404661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207966 + ... + 208045.

Almost surely, 2^16640440 is an apocalyptic number.

16640440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16640440 is an abundant number, since it is smaller than the sum of its proper divisors (20800640).

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

16640440 is a wasteful number, since it uses less digits than its factorization.

16640440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416022 (or 416018 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 16640440 is about 4079.2695424549. The cubic root of 16640440 is about 255.3024221765.

The spelling of 16640440 in words is "sixteen million, six hundred forty thousand, four hundred forty".