18400036402 has 16 divisors (see below), whose sum is σ = 30244177152. Its totient is φ = 8326145520.

The previous prime is 18400036381. The next prime is 18400036423. The reversal of 18400036402 is 20463000481.

It is an interprime number because it is at equal distance from previous prime (18400036381) and next prime (18400036423).

It is a super-2 number, since 2×18400036402² (a number of 21 digits) contains 22 as substring.

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, 1870353 + ... + 1880164.

It is an arithmetic number, because the mean of its divisors is an integer number (1890261072).

Almost surely, 2^18400036402 is an apocalyptic number.

18400036402 is a deficient number, since it is larger than the sum of its proper divisors (11844140750).

18400036402 is a wasteful number, since it uses less digits than its factorization.

18400036402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750753.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 18400036402 its reverse (20463000481), we get a palindrome (38863036883).

The spelling of 18400036402 in words is "eighteen billion, four hundred million, thirty-six thousand, four hundred two".