18936747 has 12 divisors (see below), whose sum is σ = 28366520. Its totient is φ = 12624336.

The previous prime is 18936737. The next prime is 18936767. The reversal of 18936747 is 74763981.

It is not a de Polignac number, because 18936747 - 2⁶ = 18936683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18936707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38722 + ... + 39207.

Almost surely, 2^18936747 is an apocalyptic number.

18936747 is a deficient number, since it is larger than the sum of its proper divisors (9429773).

18936747 is an frugal number, since it uses more digits than its factorization.

18936747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77944 (or 77932 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 18936747 is about 4351.6372780828. The cubic root of 18936747 is about 266.5437226669.

It can be divided in two parts, 18936 and 747, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18936747 in words is "eighteen million, nine hundred thirty-six thousand, seven hundred forty-seven".