18436992 has 128 divisors (see below), whose sum is σ = 59078400. Its totient is φ = 4990464.

The previous prime is 18436987. The next prime is 18437021. The reversal of 18436992 is 29963481.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (93312) is a multiple of the sum of its prime factors (81).

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, 970359 + ... + 970377.

It is an arithmetic number, because the mean of its divisors is an integer number (461550).

Almost surely, 2^18436992 is an apocalyptic number.

18436992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18436992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29539200).

18436992 is an abundant number, since it is smaller than the sum of its proper divisors (40641408).

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

18436992 is an frugal number, since it uses more digits than its factorization.

18436992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 31 counting only the distinct ones).

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

The square root of 18436992 is about 4293.8318551150. The cubic root of 18436992 is about 264.1780250114.

18436992 divided by its sum of digits (42) gives a cube (438976 = 76³).

The spelling of 18436992 in words is "eighteen million, four hundred thirty-six thousand, nine hundred ninety-two".