18399642 has 16 divisors (see below), whose sum is σ = 36856992. Its totient is φ = 6123600.

The previous prime is 18399637. The next prime is 18399673. The reversal of 18399642 is 24699381.

It is a junction number, because it is equal to n+sod(n) for n = 18399594 and 18399603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2517 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (2303562).

Almost surely, 2^18399642 is an apocalyptic number.

18399642 is an abundant number, since it is smaller than the sum of its proper divisors (18457350).

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

18399642 is a wasteful number, since it uses less digits than its factorization.

18399642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813.

The product of its digits is 93312, while the sum is 42.

The square root of 18399642 is about 4289.4803881123. The cubic root of 18399642 is about 263.9995121662. Note that the first 3 decimals are identical.

The spelling of 18399642 in words is "eighteen million, three hundred ninety-nine thousand, six hundred forty-two".