18942340 has 24 divisors (see below), whose sum is σ = 41509440. Its totient is φ = 7247328.

The previous prime is 18942337. The next prime is 18942349. The reversal of 18942340 is 4324981.

It is not an unprimeable number, because it can be changed into a prime (18942349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20130 + ... + 21049.

It is an arithmetic number, because the mean of its divisors is an integer number (1729560).

Almost surely, 2^18942340 is an apocalyptic number.

18942340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18942340 is an abundant number, since it is smaller than the sum of its proper divisors (22567100).

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

18942340 is a wasteful number, since it uses less digits than its factorization.

18942340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41211 (or 41209 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18942340 is about 4352.2798623250. The cubic root of 18942340 is about 266.5699614624.

The spelling of 18942340 in words is "eighteen million, nine hundred forty-two thousand, three hundred forty".