16937921 has 16 divisors (see below), whose sum is σ = 22743168. Its totient is φ = 12182400.

The previous prime is 16937903. The next prime is 16937927. The reversal of 16937921 is 12973961.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16937921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16937927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7460 + ... + 9461.

It is an arithmetic number, because the mean of its divisors is an integer number (1421448).

Almost surely, 2^16937921 is an apocalyptic number.

16937921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16937921 is a deficient number, since it is larger than the sum of its proper divisors (5805247).

16937921 is a wasteful number, since it uses less digits than its factorization.

16937921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16952.

The product of its digits is 20412, while the sum is 38.

The square root of 16937921 is about 4115.5705558282. The cubic root of 16937921 is about 256.8147918438.

The spelling of 16937921 in words is "sixteen million, nine hundred thirty-seven thousand, nine hundred twenty-one".