16640840 has 32 divisors (see below), whose sum is σ = 37558080. Its totient is φ = 6635712.

The previous prime is 16640839. The next prime is 16640843. The reversal of 16640840 is 4804661.

It is a super-4 number, since 4×16640840⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25397 + ... + 26043.

It is an arithmetic number, because the mean of its divisors is an integer number (1173690).

Almost surely, 2^16640840 is an apocalyptic number.

16640840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16640840 is an abundant number, since it is smaller than the sum of its proper divisors (20917240).

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

16640840 is a wasteful number, since it uses less digits than its factorization.

16640840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 16640840 is about 4079.3185705458. The cubic root of 16640840 is about 255.3044677985.

The spelling of 16640840 in words is "sixteen million, six hundred forty thousand, eight hundred forty".