16645940 has 12 divisors (see below), whose sum is σ = 34956516. Its totient is φ = 6658368.

The previous prime is 16645939. The next prime is 16645973. The reversal of 16645940 is 4954661.

It can be written as a sum of positive squares in 2 ways, for example, as 10061584 + 6584356 = 3172^2 + 2566^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16645940.

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, 416129 + ... + 416168.

It is an arithmetic number, because the mean of its divisors is an integer number (2913043).

Almost surely, 2^16645940 is an apocalyptic number.

16645940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16645940 is an abundant number, since it is smaller than the sum of its proper divisors (18310576).

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

16645940 is a wasteful number, since it uses less digits than its factorization.

16645940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832306 (or 832304 counting only the distinct ones).

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

The square root of 16645940 is about 4079.9436270615. The cubic root of 16645940 is about 255.3305466060.

The spelling of 16645940 in words is "sixteen million, six hundred forty-five thousand, nine hundred forty".