18672290 has 96 divisors (see below), whose sum is σ = 44561664. Its totient is φ = 5483520.

The previous prime is 18672281. The next prime is 18672319. The reversal of 18672290 is 9227681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 18672290.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 262955 + ... + 263025.

It is an arithmetic number, because the mean of its divisors is an integer number (464184).

Almost surely, 2^18672290 is an apocalyptic number.

18672290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18672290 is an abundant number, since it is smaller than the sum of its proper divisors (25889374).

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

18672290 is a wasteful number, since it uses less digits than its factorization.

18672290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18672290 is about 4321.1445243130. The cubic root of 18672290 is about 265.2971154294.

The spelling of 18672290 in words is "eighteen million, six hundred seventy-two thousand, two hundred ninety".