18942138 has 24 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 6277704.

The previous prime is 18942109. The next prime is 18942139. The reversal of 18942138 is 83124981.

It is a super-2 number, since 2×18942138² = 717609184022088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18942139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283 + ... + 6161.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^18942138 is an apocalyptic number.

18942138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18942138 is an abundant number, since it is smaller than the sum of its proper divisors (22335462).

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

18942138 is a wasteful number, since it uses less digits than its factorization.

18942138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066 (or 6063 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18942138 is about 4352.2566560349. The cubic root of 18942138 is about 266.5690138969.

The spelling of 18942138 in words is "eighteen million, nine hundred forty-two thousand, one hundred thirty-eight".