18431942 has 4 divisors (see below), whose sum is σ = 27647916. Its totient is φ = 9215970.

The previous prime is 18431923. The next prime is 18431951. The reversal of 18431942 is 24913481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24913481 = 67 ⋅371843.

It is a junction number, because it is equal to n+sod(n) for n = 18431899 and 18431908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4607984 + ... + 4607987.

It is an arithmetic number, because the mean of its divisors is an integer number (6911979).

Almost surely, 2^18431942 is an apocalyptic number.

18431942 is a deficient number, since it is larger than the sum of its proper divisors (9215974).

18431942 is an equidigital number, since it uses as much as digits as its factorization.

18431942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215973.

The product of its digits is 6912, while the sum is 32.

The square root of 18431942 is about 4293.2437620056. The cubic root of 18431942 is about 264.1539028398.

The spelling of 18431942 in words is "eighteen million, four hundred thirty-one thousand, nine hundred forty-two".