18988479 has 8 divisors (see below), whose sum is σ = 28131120. Its totient is φ = 12658968.

The previous prime is 18988471. The next prime is 18988483. The reversal of 18988479 is 97488981.

It is not a de Polignac number, because 18988479 - 2³ = 18988471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351612 + ... + 351665.

It is an arithmetic number, because the mean of its divisors is an integer number (3516390).

Almost surely, 2^18988479 is an apocalyptic number.

18988479 is a deficient number, since it is larger than the sum of its proper divisors (9142641).

18988479 is an equidigital number, since it uses as much as digits as its factorization.

18988479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703286 (or 703280 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 18988479 is about 4357.5771938085. The cubic root of 18988479 is about 266.7862194840.

The spelling of 18988479 in words is "eighteen million, nine hundred eighty-eight thousand, four hundred seventy-nine".