16993825 has 6 divisors (see below), whose sum is σ = 21072374. Its totient is φ = 13595040.

The previous prime is 16993819. The next prime is 16993831. The reversal of 16993825 is 52839961.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16993819) and next prime (16993831).

It can be written as a sum of positive squares in 3 ways, for example, as 404496 + 16589329 = 636^2 + 4073^2 .

It is not a de Polignac number, because 16993825 - 2³ = 16993817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339852 + ... + 339901.

Almost surely, 2^16993825 is an apocalyptic number.

It is an amenable number.

16993825 is a deficient number, since it is larger than the sum of its proper divisors (4078549).

16993825 is an equidigital number, since it uses as much as digits as its factorization.

16993825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679763 (or 679758 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 16993825 is about 4122.3567288628. The cubic root of 16993825 is about 257.0970226214.

The spelling of 16993825 in words is "sixteen million, nine hundred ninety-three thousand, eight hundred twenty-five".