18311309940 has 144 divisors (see below), whose sum is σ = 64407563136. Its totient is φ = 3804936960.

The previous prime is 18311309923. The next prime is 18311309957. The reversal of 18311309940 is 4990311381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18311309923) and next prime (18311309957).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129339 + ... + 230978.

It is an arithmetic number, because the mean of its divisors is an integer number (447274744).

Almost surely, 2^18311309940 is an apocalyptic number.

18311309940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18311309940 is an abundant number, since it is smaller than the sum of its proper divisors (46096253196).

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

18311309940 is a wasteful number, since it uses less digits than its factorization.

18311309940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360358 (or 360345 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 18311309940 in words is "eighteen billion, three hundred eleven million, three hundred nine thousand, nine hundred forty".