18974479 has 4 divisors (see below), whose sum is σ = 18992584. Its totient is φ = 18956376.

The previous prime is 18974441. The next prime is 18974489. The reversal of 18974479 is 97447981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97447981 = 563 ⋅173087.

It is a cyclic number.

It is not a de Polignac number, because 18974479 - 2¹³ = 18966287 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 (18974489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7377 + ... + 9610.

It is an arithmetic number, because the mean of its divisors is an integer number (4748146).

Almost surely, 2^18974479 is an apocalyptic number.

18974479 is a deficient number, since it is larger than the sum of its proper divisors (18105).

18974479 is a wasteful number, since it uses less digits than its factorization.

18974479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18104.

The product of its digits is 508032, while the sum is 49.

The square root of 18974479 is about 4355.9705003592. The cubic root of 18974479 is about 266.7206371665.

The spelling of 18974479 in words is "eighteen million, nine hundred seventy-four thousand, four hundred seventy-nine".