16977321 has 24 divisors (see below), whose sum is σ = 25378080. Its totient is φ = 10929600.

The previous prime is 16977319. The next prime is 16977341. The reversal of 16977321 is 12377961.

It is a happy number.

It is not a de Polignac number, because 16977321 - 2¹ = 16977319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16977341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51126 + ... + 51456.

It is an arithmetic number, because the mean of its divisors is an integer number (1057420).

Almost surely, 2^16977321 is an apocalyptic number.

It is an amenable number.

16977321 is a deficient number, since it is larger than the sum of its proper divisors (8400759).

16977321 is a wasteful number, since it uses less digits than its factorization.

16977321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 514 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 16977321 is about 4120.3544750422. The cubic root of 16977321 is about 257.0137668189.

The spelling of 16977321 in words is "sixteen million, nine hundred seventy-seven thousand, three hundred twenty-one".