18380478 has 16 divisors (see below), whose sum is σ = 37543680. Its totient is φ = 5996376.

The previous prime is 18380471. The next prime is 18380497. The reversal of 18380478 is 87408381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18380471) 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, 32308 + ... + 32871.

It is an arithmetic number, because the mean of its divisors is an integer number (2346480).

Almost surely, 2^18380478 is an apocalyptic number.

18380478 is an abundant number, since it is smaller than the sum of its proper divisors (19163202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18380478 is a wasteful number, since it uses less digits than its factorization.

18380478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65231.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 18380478 is about 4287.2459691508. The cubic root of 18380478 is about 263.9078247998.

The spelling of 18380478 in words is "eighteen million, three hundred eighty thousand, four hundred seventy-eight".