18839140 has 24 divisors (see below), whose sum is σ = 40122432. Its totient is φ = 7428960.

The previous prime is 18839137. The next prime is 18839141. The reversal of 18839140 is 4193881.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18839096 and 18839105.

It is not an unprimeable number, because it can be changed into a prime (18839141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5214 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (1671768).

Almost surely, 2^18839140 is an apocalyptic number.

18839140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18839140 is an abundant number, since it is smaller than the sum of its proper divisors (21283292).

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

18839140 is a wasteful number, since it uses less digits than its factorization.

18839140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347 (or 13345 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18839140 is about 4340.4078149409. The cubic root of 18839140 is about 266.0849785966.

The spelling of 18839140 in words is "eighteen million, eight hundred thirty-nine thousand, one hundred forty".