18722479 has 4 divisors (see below), whose sum is σ = 18731440. Its totient is φ = 18713520.

The previous prime is 18722461. The next prime is 18722489. The reversal of 18722479 is 97422781.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97422781 = 1637 ⋅59513.

It is a cyclic number.

It is not a de Polignac number, because 18722479 - 2¹¹ = 18720431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722449) 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, 499 + ... + 6139.

It is an arithmetic number, because the mean of its divisors is an integer number (4682860).

Almost surely, 2^18722479 is an apocalyptic number.

18722479 is a deficient number, since it is larger than the sum of its proper divisors (8961).

18722479 is an equidigital number, since it uses as much as digits as its factorization.

18722479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960.

The product of its digits is 56448, while the sum is 40.

The square root of 18722479 is about 4326.9480006120. The cubic root of 18722479 is about 265.5345989763.

The spelling of 18722479 in words is "eighteen million, seven hundred twenty-two thousand, four hundred seventy-nine".