18339340 has 24 divisors (see below), whose sum is σ = 38949120. Its totient is φ = 7252608.

The previous prime is 18339337. The next prime is 18339361. The reversal of 18339340 is 4393381.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3372 + ... + 6931.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^18339340 is an apocalyptic number.

18339340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18339340 is an abundant number, since it is smaller than the sum of its proper divisors (20609780).

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

18339340 is a wasteful number, since it uses less digits than its factorization.

18339340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10401 (or 10399 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18339340 is about 4282.4455629932. The cubic root of 18339340 is about 263.7107905746.

The spelling of 18339340 in words is "eighteen million, three hundred thirty-nine thousand, three hundred forty".