18243390730 has 8 divisors (see below), whose sum is σ = 32838103332. Its totient is φ = 7297356288.

The previous prime is 18243390701. The next prime is 18243390751. The reversal of 18243390730 is 3709334281.

It can be written as a sum of positive squares in 2 ways, for example, as 17926799881 + 316590849 = 133891^2 + 17793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912169527 + ... + 912169546.

Almost surely, 2^18243390730 is an apocalyptic number.

18243390730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18243390730 is a deficient number, since it is larger than the sum of its proper divisors (14594712602).

18243390730 is a wasteful number, since it uses less digits than its factorization.

18243390730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824339080.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 18243390730 in words is "eighteen billion, two hundred forty-three million, three hundred ninety thousand, seven hundred thirty".