18990492 has 12 divisors (see below), whose sum is σ = 44311176. Its totient is φ = 6330160.

The previous prime is 18990487. The next prime is 18990493. The reversal of 18990492 is 29409981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990493) 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 3 ways as a sum of consecutive naturals, for example, 791259 + ... + 791282.

It is an arithmetic number, because the mean of its divisors is an integer number (3692598).

Almost surely, 2^18990492 is an apocalyptic number.

18990492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18990492 is an abundant number, since it is smaller than the sum of its proper divisors (25320684).

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

18990492 is a wasteful number, since it uses less digits than its factorization.

18990492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582548 (or 1582546 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 18990492 is about 4357.8081646626. The cubic root of 18990492 is about 266.7956466334.

The spelling of 18990492 in words is "eighteen million, nine hundred ninety thousand, four hundred ninety-two".