16400525 has 12 divisors (see below), whose sum is σ = 20683200. Its totient is φ = 12896880.

The previous prime is 16400513. The next prime is 16400539. The reversal of 16400525 is 52500461.

It is not a de Polignac number, because 16400525 - 2⁸ = 16400269 is a prime.

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 16400525.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4085 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (1723600).

Almost surely, 2^16400525 is an apocalyptic number.

It is an amenable number.

16400525 is a deficient number, since it is larger than the sum of its proper divisors (4282675).

16400525 is a wasteful number, since it uses less digits than its factorization.

16400525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188 (or 11183 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 16400525 is about 4049.7561654994. The cubic root of 16400525 is about 254.0695296044.

Adding to 16400525 its reverse (52500461), we get a palindrome (68900986).

The spelling of 16400525 in words is "sixteen million, four hundred thousand, five hundred twenty-five".