18943992 has 24 divisors (see below), whose sum is σ = 51306840. Its totient is φ = 6314640.

The previous prime is 18943957. The next prime is 18943993. The reversal of 18943992 is 29934981.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131484 + ... + 131627.

It is an arithmetic number, because the mean of its divisors is an integer number (2137785).

Almost surely, 2^18943992 is an apocalyptic number.

18943992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18943992 is an abundant number, since it is smaller than the sum of its proper divisors (32362848).

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

18943992 is a wasteful number, since it uses less digits than its factorization.

18943992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263123 (or 263116 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 18943992 is about 4352.4696437770. The cubic root of 18943992 is about 266.5777106067.

It can be divided in two parts, 1894 and 3992, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 18943992 in words is "eighteen million, nine hundred forty-three thousand, nine hundred ninety-two".