18672425 has 12 divisors (see below), whose sum is σ = 23719836. Its totient is φ = 14572800.

The previous prime is 18672419. The next prime is 18672461. The reversal of 18672425 is 52427681.

It can be written as a sum of positive squares in 6 ways, for example, as 5400976 + 13271449 = 2324^2 + 3643^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18672425 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8084 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (1976653).

Almost surely, 2^18672425 is an apocalyptic number.

It is an amenable number.

18672425 is a deficient number, since it is larger than the sum of its proper divisors (5047411).

18672425 is a wasteful number, since it uses less digits than its factorization.

18672425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18268 (or 18263 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 18672425 is about 4321.1601451462. The cubic root of 18672425 is about 265.2977547908.

The spelling of 18672425 in words is "eighteen million, six hundred seventy-two thousand, four hundred twenty-five".