18972345 has 32 divisors (see below), whose sum is σ = 35055360. Its totient is φ = 8582400.

The previous prime is 18972313. The next prime is 18972353. The reversal of 18972345 is 54327981.

It is not a de Polignac number, because 18972345 - 2⁵ = 18972313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9711 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (1095480).

Almost surely, 2^18972345 is an apocalyptic number.

18972345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18972345 is a deficient number, since it is larger than the sum of its proper divisors (16083015).

18972345 is a wasteful number, since it uses less digits than its factorization.

18972345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905.

The product of its digits is 60480, while the sum is 39.

The square root of 18972345 is about 4355.7255423178. The cubic root of 18972345 is about 266.7106377144.

The spelling of 18972345 in words is "eighteen million, nine hundred seventy-two thousand, three hundred forty-five".