18683940 has 48 divisors (see below), whose sum is σ = 57072960. Its totient is φ = 4529280.

The previous prime is 18683921. The next prime is 18683941. The reversal of 18683940 is 4938681.

It is a super-2 number, since 2×18683940² = 698179227847200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18683941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13495 + ... + 14814.

It is an arithmetic number, because the mean of its divisors is an integer number (1189020).

Almost surely, 2^18683940 is an apocalyptic number.

18683940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18683940 is an abundant number, since it is smaller than the sum of its proper divisors (38389020).

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

18683940 is a wasteful number, since it uses less digits than its factorization.

18683940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28332 (or 28330 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18683940 is about 4322.4923366040. The cubic root of 18683940 is about 265.3522786121.

The spelling of 18683940 in words is "eighteen million, six hundred eighty-three thousand, nine hundred forty".