18305263438 has 16 divisors (see below), whose sum is σ = 34233220224. Its totient is φ = 7131920760.

The previous prime is 18305263397. The next prime is 18305263463. The reversal of 18305263438 is 83436250381.

It is a junction number, because it is equal to n+sod(n) for n = 18305263394 and 18305263403.

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, 59432520 + ... + 59432827.

It is an arithmetic number, because the mean of its divisors is an integer number (2139576264).

Almost surely, 2^18305263438 is an apocalyptic number.

18305263438 is a deficient number, since it is larger than the sum of its proper divisors (15927956786).

18305263438 is a wasteful number, since it uses less digits than its factorization.

18305263438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118865367.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 18305263438 in words is "eighteen billion, three hundred five million, two hundred sixty-three thousand, four hundred thirty-eight".