18422478 has 20 divisors (see below), whose sum is σ = 41280360. Its totient is φ = 6140772.

The previous prime is 18422389. The next prime is 18422479. The reversal of 18422478 is 87422481.

18422478 is a `hidden beast` number, since 184 + 2 + 2 + 478 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18422479) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 56698 + ... + 57021.

It is an arithmetic number, because the mean of its divisors is an integer number (2064018).

Almost surely, 2^18422478 is an apocalyptic number.

18422478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18422478 is an abundant number, since it is smaller than the sum of its proper divisors (22857882).

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

18422478 is a wasteful number, since it uses less digits than its factorization.

18422478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113733 (or 113724 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 18422478 is about 4292.1414235787. The cubic root of 18422478 is about 264.1086845890.

The spelling of 18422478 in words is "eighteen million, four hundred twenty-two thousand, four hundred seventy-eight".