18724379 has 4 divisors (see below), whose sum is σ = 18749376. Its totient is φ = 18699384.

The previous prime is 18724373. The next prime is 18724397. The reversal of 18724379 is 97342781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97342781 = 47 ⋅2071123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18724379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18724373) 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, 11339 + ... + 12884.

It is an arithmetic number, because the mean of its divisors is an integer number (4687344).

Almost surely, 2^18724379 is an apocalyptic number.

18724379 is a deficient number, since it is larger than the sum of its proper divisors (24997).

18724379 is an equidigital number, since it uses as much as digits as its factorization.

18724379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24996.

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

The square root of 18724379 is about 4327.1675493329. The cubic root of 18724379 is about 265.5435810254.

The spelling of 18724379 in words is "eighteen million, seven hundred twenty-four thousand, three hundred seventy-nine".