18400002 has 16 divisors (see below), whose sum is σ = 36936192. Its totient is φ = 6110640.

The previous prime is 18399973. The next prime is 18400003. The reversal of 18400002 is 20000481.

It is not an unprimeable number, because it can be changed into a prime (18400003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3874 + ... + 7197.

It is an arithmetic number, because the mean of its divisors is an integer number (2308512).

Almost surely, 2^18400002 is an apocalyptic number.

18400002 is an abundant number, since it is smaller than the sum of its proper divisors (18536190).

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

18400002 is a wasteful number, since it uses less digits than its factorization.

18400002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11353.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 18400002 is about 4289.5223510316. The cubic root of 18400002 is about 264.0012339244.

Adding to 18400002 its reverse (20000481), we get a palindrome (38400483).

The spelling of 18400002 in words is "eighteen million, four hundred thousand, two".