18211245940 has 24 divisors (see below), whose sum is σ = 38415121920. Its totient is φ = 7251830688.

The previous prime is 18211245919. The next prime is 18211245977. The reversal of 18211245940 is 4954211281.

It is a self number, because there is not a number n which added to its sum of digits gives 18211245940.

It is a congruent number.

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, 2037160 + ... + 2046079.

It is an arithmetic number, because the mean of its divisors is an integer number (1600630080).

Almost surely, 2^18211245940 is an apocalyptic number.

18211245940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18211245940 is an abundant number, since it is smaller than the sum of its proper divisors (20203875980).

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

18211245940 is a wasteful number, since it uses less digits than its factorization.

18211245940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083471 (or 4083469 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 18211245940 in words is "eighteen billion, two hundred eleven million, two hundred forty-five thousand, nine hundred forty".