18393479730 has 128 divisors (see below), whose sum is σ = 51470899200. Its totient is φ = 4665177792.

The previous prime is 18393479729. The next prime is 18393479747. The reversal of 18393479730 is 3797439381.

It is a happy number.

18393479730 is a `hidden beast` number, since 1 + 83 + 93 + 479 + 7 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1103317 + ... + 1119863.

It is an arithmetic number, because the mean of its divisors is an integer number (402116400).

Almost surely, 2^18393479730 is an apocalyptic number.

18393479730 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 18393479730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25735449600).

18393479730 is an abundant number, since it is smaller than the sum of its proper divisors (33077419470).

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

18393479730 is a wasteful number, since it uses less digits than its factorization.

18393479730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16765 (or 16759 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 18393479730 in words is "eighteen billion, three hundred ninety-three million, four hundred seventy-nine thousand, seven hundred thirty".