18671425 has 12 divisors (see below), whose sum is σ = 23240700. Its totient is φ = 14880320.

The previous prime is 18671407. The next prime is 18671449. The reversal of 18671425 is 52417681.

It can be written as a sum of positive squares in 6 ways, for example, as 2663424 + 16008001 = 1632^2 + 4001^2 .

It is not a de Polignac number, because 18671425 - 2⁷ = 18671297 is a prime.

It is a super-2 number, since 2×18671425² = 697244223061250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6051 + ... + 8599.

It is an arithmetic number, because the mean of its divisors is an integer number (1936725).

Almost surely, 2^18671425 is an apocalyptic number.

It is an amenable number.

18671425 is a deficient number, since it is larger than the sum of its proper divisors (4569275).

18671425 is a wasteful number, since it uses less digits than its factorization.

18671425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852 (or 2847 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 18671425 is about 4321.0444339303. The cubic root of 18671425 is about 265.2930187073.

The spelling of 18671425 in words is "eighteen million, six hundred seventy-one thousand, four hundred twenty-five".