18390605240 has 32 divisors (see below), whose sum is σ = 47290128480. Its totient is φ = 6305350272.

The previous prime is 18390605201. The next prime is 18390605243. The reversal of 18390605240 is 4250609381.

It is a happy number.

It is a super-2 number, since 2×18390605240² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18390605194 and 18390605203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390605243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32840087 + ... + 32840646.

It is an arithmetic number, because the mean of its divisors is an integer number (1477816515).

Almost surely, 2^18390605240 is an apocalyptic number.

18390605240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18390605240 is an abundant number, since it is smaller than the sum of its proper divisors (28899523240).

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

18390605240 is a wasteful number, since it uses less digits than its factorization.

18390605240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65680751 (or 65680747 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 18390605240 in words is "eighteen billion, three hundred ninety million, six hundred five thousand, two hundred forty".