18557970 has 64 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 4702208.

The previous prime is 18557963. The next prime is 18557971. The reversal of 18557970 is 7975581.

18557970 = T₂₃₉ + T₂₄₀ + ... + T₄₉₉.

It is not an unprimeable number, because it can be changed into a prime (18557971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72082 + ... + 72338.

It is an arithmetic number, because the mean of its divisors is an integer number (731430).

Almost surely, 2^18557970 is an apocalyptic number.

18557970 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 18557970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23405760).

18557970 is an abundant number, since it is smaller than the sum of its proper divisors (28253550).

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

18557970 is a wasteful number, since it uses less digits than its factorization.

18557970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 18557970 is about 4307.8962383047. The cubic root of 18557970 is about 264.7545847063.

The spelling of 18557970 in words is "eighteen million, five hundred fifty-seven thousand, nine hundred seventy".