18972434 has 16 divisors (see below), whose sum is σ = 31637760. Its totient is φ = 8473680.

The previous prime is 18972419. The next prime is 18972449. The reversal of 18972434 is 43427981.

It is an interprime number because it is at equal distance from previous prime (18972419) and next prime (18972449).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10964 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (1977360).

Almost surely, 2^18972434 is an apocalyptic number.

18972434 is a deficient number, since it is larger than the sum of its proper divisors (12665326).

18972434 is a wasteful number, since it uses less digits than its factorization.

18972434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23585.

The product of its digits is 48384, while the sum is 38.

The square root of 18972434 is about 4355.7357587439. The cubic root of 18972434 is about 266.7110547637.

The spelling of 18972434 in words is "eighteen million, nine hundred seventy-two thousand, four hundred thirty-four".