18967940 has 24 divisors (see below), whose sum is σ = 40125120. Its totient is φ = 7531488.

The previous prime is 18967933. The next prime is 18967951. The reversal of 18967940 is 4976981.

It is a junction number, because it is equal to n+sod(n) for n = 18967891 and 18967900.

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, 632 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (1671880).

Almost surely, 2^18967940 is an apocalyptic number.

18967940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18967940 is an abundant number, since it is smaller than the sum of its proper divisors (21157180).

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

18967940 is a wasteful number, since it uses less digits than its factorization.

18967940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971 (or 6969 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 18967940 is about 4355.2198566777. The cubic root of 18967940 is about 266.6899944870.

The spelling of 18967940 in words is "eighteen million, nine hundred sixty-seven thousand, nine hundred forty".