18120738 has 8 divisors (see below), whose sum is σ = 36241488. Its totient is φ = 6040244.

The previous prime is 18120733. The next prime is 18120749. The reversal of 18120738 is 83702181.

It is a happy number.

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

18120738 is an admirable number.

It is a super-2 number, since 2×18120738² = 656722291329288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18120731) 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, 1510056 + ... + 1510067.

It is an arithmetic number, because the mean of its divisors is an integer number (4530186).

Almost surely, 2^18120738 is an apocalyptic number.

18120738 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.

18120738 is a wasteful number, since it uses less digits than its factorization.

18120738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3020128.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18120738 is about 4256.8460155378. The cubic root of 18120738 is about 262.6588027770.

The spelling of 18120738 in words is "eighteen million, one hundred twenty thousand, seven hundred thirty-eight".