18831130 has 8 divisors (see below), whose sum is σ = 33896052. Its totient is φ = 7532448.

The previous prime is 18831107. The next prime is 18831139. The reversal of 18831130 is 3113881.

It can be written as a sum of positive squares in 2 ways, for example, as 17164449 + 1666681 = 4143^2 + 1291^2 .

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

It is a super-2 number, since 2×18831130² = 709222914153800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18831095 and 18831104.

It is not an unprimeable number, because it can be changed into a prime (18831139) 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, 941547 + ... + 941566.

Almost surely, 2^18831130 is an apocalyptic number.

18831130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18831130 is a deficient number, since it is larger than the sum of its proper divisors (15064922).

18831130 is a wasteful number, since it uses less digits than its factorization.

18831130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883120.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18831130 is about 4339.4849924847. The cubic root of 18831130 is about 266.0472620339.

The spelling of 18831130 in words is "eighteen million, eight hundred thirty-one thousand, one hundred thirty".