18723974 has 4 divisors (see below), whose sum is σ = 28085964. Its totient is φ = 9361986.

The previous prime is 18723967. The next prime is 18723979. The reversal of 18723974 is 47932781.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4680992 + ... + 4680995.

It is an arithmetic number, because the mean of its divisors is an integer number (7021491).

Almost surely, 2^18723974 is an apocalyptic number.

18723974 is a deficient number, since it is larger than the sum of its proper divisors (9361990).

18723974 is an equidigital number, since it uses as much as digits as its factorization.

18723974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361989.

The product of its digits is 84672, while the sum is 41.

The square root of 18723974 is about 4327.1207517239. The cubic root of 18723974 is about 265.5416664817.

The spelling of 18723974 in words is "eighteen million, seven hundred twenty-three thousand, nine hundred seventy-four".