18137226 has 8 divisors (see below), whose sum is σ = 36274464. Its totient is φ = 6045740.

The previous prime is 18137219. The next prime is 18137227. The reversal of 18137226 is 62273181.

It is a sphenic number, since it is the product of 3 distinct primes.

18137226 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 18137193 and 18137202.

It is not an unprimeable number, because it can be changed into a prime (18137227) 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, 1511430 + ... + 1511441.

It is an arithmetic number, because the mean of its divisors is an integer number (4534308).

Almost surely, 2^18137226 is an apocalyptic number.

18137226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18137226 is a wasteful number, since it uses less digits than its factorization.

18137226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022876.

The product of its digits is 4032, while the sum is 30.

The square root of 18137226 is about 4258.7822203066. The cubic root of 18137226 is about 262.7384427546.

The spelling of 18137226 in words is "eighteen million, one hundred thirty-seven thousand, two hundred twenty-six".