18639742 has 32 divisors (see below), whose sum is σ = 31868928. Its totient is φ = 8100000.

The previous prime is 18639739. The next prime is 18639787. The reversal of 18639742 is 24793681.

It is a junction number, because it is equal to n+sod(n) for n = 18639695 and 18639704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102892 + ... + 103072.

It is an arithmetic number, because the mean of its divisors is an integer number (995904).

Almost surely, 2^18639742 is an apocalyptic number.

18639742 is a deficient number, since it is larger than the sum of its proper divisors (13229186).

18639742 is a wasteful number, since it uses less digits than its factorization.

18639742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its digits is 72576, while the sum is 40.

The square root of 18639742 is about 4317.3767498332. The cubic root of 18639742 is about 265.1428777402.

The spelling of 18639742 in words is "eighteen million, six hundred thirty-nine thousand, seven hundred forty-two".