16940657 has 4 divisors (see below), whose sum is σ = 17074176. Its totient is φ = 16807140.

The previous prime is 16940639. The next prime is 16940689. The reversal of 16940657 is 75604961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16940657 - 2⁶ = 16940593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16940657.

It is not an unprimeable number, because it can be changed into a prime (16940617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66569 + ... + 66822.

It is an arithmetic number, because the mean of its divisors is an integer number (4268544).

Almost surely, 2^16940657 is an apocalyptic number.

It is an amenable number.

16940657 is a deficient number, since it is larger than the sum of its proper divisors (133519).

16940657 is a wasteful number, since it uses less digits than its factorization.

16940657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133518.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 16940657 is about 4115.9029386029. The cubic root of 16940657 is about 256.8286189528.

The spelling of 16940657 in words is "sixteen million, nine hundred forty thousand, six hundred fifty-seven".