18440479 has 4 divisors (see below), whose sum is σ = 18623160. Its totient is φ = 18257800.

The previous prime is 18440473. The next prime is 18440489. The reversal of 18440479 is 97404481.

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

It is a cyclic number.

It is not a de Polignac number, because 18440479 - 2⁷ = 18440351 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 (18440473) 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, 91189 + ... + 91390.

It is an arithmetic number, because the mean of its divisors is an integer number (4655790).

Almost surely, 2^18440479 is an apocalyptic number.

18440479 is a deficient number, since it is larger than the sum of its proper divisors (182681).

18440479 is a wasteful number, since it uses less digits than its factorization.

18440479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182680.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18440479 is about 4294.2378834899. The cubic root of 18440479 is about 264.1946786807.

The spelling of 18440479 in words is "eighteen million, four hundred forty thousand, four hundred seventy-nine".