18198402 has 8 divisors (see below), whose sum is σ = 36396816. Its totient is φ = 6066132.

The previous prime is 18198391. The next prime is 18198407. The reversal of 18198402 is 20489181.

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

18198402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18198407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516528 + ... + 1516539.

It is an arithmetic number, because the mean of its divisors is an integer number (4549602).

Almost surely, 2^18198402 is an apocalyptic number.

18198402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18198402 is a wasteful number, since it uses less digits than its factorization.

18198402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033072.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18198402 is about 4265.9585089403. The cubic root of 18198402 is about 263.0335126711.

The spelling of 18198402 in words is "eighteen million, one hundred ninety-eight thousand, four hundred two".