18990936 has 48 divisors (see below), whose sum is σ = 53344200. Its totient is φ = 6329664.

The previous prime is 18990931. The next prime is 18990943. The reversal of 18990936 is 63909981.

It is a junction number, because it is equal to n+sod(n) for n = 18990891 and 18990900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2941 + ... + 6828.

Almost surely, 2^18990936 is an apocalyptic number.

It is an amenable number.

18990936 is an abundant number, since it is smaller than the sum of its proper divisors (34353264).

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

18990936 is an equidigital number, since it uses as much as digits as its factorization.

18990936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9790 (or 9774 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 18990936 is about 4357.8591074058. The cubic root of 18990936 is about 266.7977258553.

It can be divided in two parts, 189 and 90936, that added together give a cube (91125 = 45³).

The spelling of 18990936 in words is "eighteen million, nine hundred ninety thousand, nine hundred thirty-six".