18939765 has 16 divisors (see below), whose sum is σ = 32635008. Its totient is φ = 9324096.

The previous prime is 18939757. The next prime is 18939793. The reversal of 18939765 is 56793981.

It is not a de Polignac number, because 18939765 - 2³ = 18939757 is a prime.

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, 48369 + ... + 48758.

It is an arithmetic number, because the mean of its divisors is an integer number (2039688).

Almost surely, 2^18939765 is an apocalyptic number.

18939765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18939765 is a deficient number, since it is larger than the sum of its proper divisors (13695243).

18939765 is a wasteful number, since it uses less digits than its factorization.

18939765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97148.

The product of its digits is 408240, while the sum is 48.

The square root of 18939765 is about 4351.9840303016. The cubic root of 18939765 is about 266.5578818433.

It can be divided in two parts, 1893976 and 5, that added together give a palindrome (1893981).

The spelling of 18939765 in words is "eighteen million, nine hundred thirty-nine thousand, seven hundred sixty-five".