16945640 has 32 divisors (see below), whose sum is σ = 38702880. Its totient is φ = 6676032.

The previous prime is 16945639. The next prime is 16945661. The reversal of 16945640 is 4654961.

It is a self number, because there is not a number n which added to its sum of digits gives 16945640.

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, 482 + ... + 5841.

It is an arithmetic number, because the mean of its divisors is an integer number (1209465).

Almost surely, 2^16945640 is an apocalyptic number.

16945640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16945640 is an abundant number, since it is smaller than the sum of its proper divisors (21757240).

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

16945640 is a wasteful number, since it uses less digits than its factorization.

16945640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6401 (or 6397 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16945640 is about 4116.5082290699. The cubic root of 16945640 is about 256.8537980539.

The spelling of 16945640 in words is "sixteen million, nine hundred forty-five thousand, six hundred forty".