18645642 has 12 divisors (see below), whose sum is σ = 40398930. Its totient is φ = 6215208.

The previous prime is 18645629. The next prime is 18645643. The reversal of 18645642 is 24654681.

18645642 is a `hidden beast` number, since 1 + 8 + 6 + 4 + 5 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 2653641 = 3999^2 + 1629^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18645597 and 18645606.

It is not an unprimeable number, because it can be changed into a prime (18645643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 517917 + ... + 517952.

Almost surely, 2^18645642 is an apocalyptic number.

18645642 is an abundant number, since it is smaller than the sum of its proper divisors (21753288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18645642 is a wasteful number, since it uses less digits than its factorization.

18645642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035877 (or 1035874 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 18645642 is about 4318.0599810563. The cubic root of 18645642 is about 265.1708498361.

The spelling of 18645642 in words is "eighteen million, six hundred forty-five thousand, six hundred forty-two".