18405132402 has 32 divisors (see below), whose sum is σ = 38703862080. Its totient is φ = 5826381120.

The previous prime is 18405132391. The next prime is 18405132437. The reversal of 18405132402 is 20423150481.

It is a self number, because there is not a number n which added to its sum of digits gives 18405132402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856408 + ... + 877635.

It is an arithmetic number, because the mean of its divisors is an integer number (1209495690).

Almost surely, 2^18405132402 is an apocalyptic number.

18405132402 is an abundant number, since it is smaller than the sum of its proper divisors (20298729678).

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

18405132402 is a wasteful number, since it uses less digits than its factorization.

18405132402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734138.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 18405132402 its reverse (20423150481), we get a palindrome (38828282883).

The spelling of 18405132402 in words is "eighteen billion, four hundred five million, one hundred thirty-two thousand, four hundred two".