18208367940 has 48 divisors (see below), whose sum is σ = 58266778752. Its totient is φ = 4161912576.

The previous prime is 18208367929. The next prime is 18208367963. The reversal of 18208367940 is 4976380281.

It is a self number, because there is not a number n which added to its sum of digits gives 18208367940.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21676209 + ... + 21677048.

It is an arithmetic number, because the mean of its divisors is an integer number (1213891224).

Almost surely, 2^18208367940 is an apocalyptic number.

18208367940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18208367940 is an abundant number, since it is smaller than the sum of its proper divisors (40058410812).

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

18208367940 is a wasteful number, since it uses less digits than its factorization.

18208367940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43353276 (or 43353274 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 18208367940 in words is "eighteen billion, two hundred eight million, three hundred sixty-seven thousand, nine hundred forty".