16978725 has 36 divisors (see below), whose sum is σ = 30950400. Its totient is φ = 8894880.

The previous prime is 16978721. The next prime is 16978769. The reversal of 16978725 is 52787961.

It is not a de Polignac number, because 16978725 - 2² = 16978721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16978721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12636 + ... + 13914.

Almost surely, 2^16978725 is an apocalyptic number.

16978725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16978725 is a deficient number, since it is larger than the sum of its proper divisors (13971675).

16978725 is a wasteful number, since it uses less digits than its factorization.

16978725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1346 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 16978725 is about 4120.5248452109. The cubic root of 16978725 is about 257.0208515131.

The spelling of 16978725 in words is "sixteen million, nine hundred seventy-eight thousand, seven hundred twenty-five".