18139770 has 96 divisors (see below), whose sum is σ = 52363584. Its totient is φ = 4320000.

The previous prime is 18139769. The next prime is 18139783. The reversal of 18139770 is 7793181.

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, 72145 + ... + 72395.

It is an arithmetic number, because the mean of its divisors is an integer number (545454).

Almost surely, 2^18139770 is an apocalyptic number.

18139770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18139770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26181792).

18139770 is an abundant number, since it is smaller than the sum of its proper divisors (34223814).

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

18139770 is a wasteful number, since it uses less digits than its factorization.

18139770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 18139770 is about 4259.0808867642. The cubic root of 18139770 is about 262.7507264292.

The spelling of 18139770 in words is "eighteen million, one hundred thirty-nine thousand, seven hundred seventy".