18431974 has 8 divisors (see below), whose sum is σ = 30161448. Its totient is φ = 8378160.

The previous prime is 18431971. The next prime is 18431983. The reversal of 18431974 is 47913481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18431971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418887 + ... + 418930.

It is an arithmetic number, because the mean of its divisors is an integer number (3770181).

Almost surely, 2^18431974 is an apocalyptic number.

18431974 is a deficient number, since it is larger than the sum of its proper divisors (11729474).

18431974 is a wasteful number, since it uses less digits than its factorization.

18431974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837830.

The product of its digits is 24192, while the sum is 37.

The square root of 18431974 is about 4293.2474887898. The cubic root of 18431974 is about 264.1540557071.

The spelling of 18431974 in words is "eighteen million, four hundred thirty-one thousand, nine hundred seventy-four".