16399125 has 64 divisors (see below), whose sum is σ = 31299840. Its totient is φ = 8467200.

The previous prime is 16399091. The next prime is 16399133. The reversal of 16399125 is 52199361.

16399125 is a `hidden beast` number, since 1 + 639 + 9 + 12 + 5 = 666.

It is not a de Polignac number, because 16399125 - 2⁸ = 16398869 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (14580) is a multiple of the sum of its prime factors (180).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16399125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145069 + ... + 145181.

It is an arithmetic number, because the mean of its divisors is an integer number (489060).

Almost surely, 2^16399125 is an apocalyptic number.

16399125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16399125 is a deficient number, since it is larger than the sum of its proper divisors (14900715).

16399125 is a wasteful number, since it uses less digits than its factorization.

16399125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 164 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 16399125 is about 4049.5833118977. The cubic root of 16399125 is about 254.0623000094.

The spelling of 16399125 in words is "sixteen million, three hundred ninety-nine thousand, one hundred twenty-five".