18955992 has 64 divisors (see below), whose sum is σ = 52617600. Its totient is φ = 5642240.

The previous prime is 18955987. The next prime is 18956009. The reversal of 18955992 is 29955981.

It is a happy number.

Its product of digits (291600) is a multiple of the sum of its prime factors (1296).

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, 14968 + ... + 16184.

It is an arithmetic number, because the mean of its divisors is an integer number (822150).

Almost surely, 2^18955992 is an apocalyptic number.

18955992 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 18955992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26308800).

18955992 is an abundant number, since it is smaller than the sum of its proper divisors (33661608).

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

18955992 is a wasteful number, since it uses less digits than its factorization.

18955992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1292 counting only the distinct ones).

The product of its digits is 291600, while the sum is 48.

The square root of 18955992 is about 4353.8479532478. The cubic root of 18955992 is about 266.6339862729.

It can be divided in two parts, 1895 and 5992, that added together give a palindrome (7887).

The spelling of 18955992 in words is "eighteen million, nine hundred fifty-five thousand, nine hundred ninety-two".