18406053940 has 12 divisors (see below), whose sum is σ = 38652713316. Its totient is φ = 7362421568.

The previous prime is 18406053931. The next prime is 18406053971. The reversal of 18406053940 is 4935060481.

It can be written as a sum of positive squares in 2 ways, for example, as 11641978404 + 6764075536 = 107898^2 + 82244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18406053893 and 18406053902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460151329 + ... + 460151368.

It is an arithmetic number, because the mean of its divisors is an integer number (3221059443).

Almost surely, 2^18406053940 is an apocalyptic number.

18406053940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18406053940 is an abundant number, since it is smaller than the sum of its proper divisors (20246659376).

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

18406053940 is a wasteful number, since it uses less digits than its factorization.

18406053940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920302706 (or 920302704 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 18406053940 in words is "eighteen billion, four hundred six million, fifty-three thousand, nine hundred forty".