18534213990 has 128 divisors (see below), whose sum is σ = 49811811840. Its totient is φ = 4903920000.

The previous prime is 18534213967. The next prime is 18534214007. The reversal of 18534213990 is 9931243581.

It is a happy number.

18534213990 is a `hidden beast` number, since 1 + 8 + 534 + 21 + 3 + 9 + 90 = 666.

It is a super-2 number, since 2×18534213990² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33274792 + ... + 33275348.

It is an arithmetic number, because the mean of its divisors is an integer number (389154780).

Almost surely, 2^18534213990 is an apocalyptic number.

18534213990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18534213990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24905905920).

18534213990 is an abundant number, since it is smaller than the sum of its proper divisors (31277597850).

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

18534213990 is a wasteful number, since it uses less digits than its factorization.

18534213990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 18534213990 in words is "eighteen billion, five hundred thirty-four million, two hundred thirteen thousand, nine hundred ninety".