18939642 has 16 divisors (see below), whose sum is σ = 38234592. Its totient is φ = 6254000.

The previous prime is 18939629. The next prime is 18939643. The reversal of 18939642 is 24693981.

It is a junction number, because it is equal to n+sod(n) for n = 18939594 and 18939603.

It is not an unprimeable number, because it can be changed into a prime (18939643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14109 + ... + 15392.

It is an arithmetic number, because the mean of its divisors is an integer number (2389662).

Almost surely, 2^18939642 is an apocalyptic number.

18939642 is an abundant number, since it is smaller than the sum of its proper divisors (19294950).

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

18939642 is a wasteful number, since it uses less digits than its factorization.

18939642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29613.

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

The square root of 18939642 is about 4351.9698987930. The cubic root of 18939642 is about 266.5573048088.

The spelling of 18939642 in words is "eighteen million, nine hundred thirty-nine thousand, six hundred forty-two".