18401898 has 8 divisors (see below), whose sum is σ = 36803808. Its totient is φ = 6133964.

The previous prime is 18401857. The next prime is 18401927. The reversal of 18401898 is 89810481.

It is a happy number.

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

18401898 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533486 + ... + 1533497.

It is an arithmetic number, because the mean of its divisors is an integer number (4600476).

Almost surely, 2^18401898 is an apocalyptic number.

18401898 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.

18401898 is a wasteful number, since it uses less digits than its factorization.

18401898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066988.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18401898 is about 4289.7433489662. The cubic root of 18401898 is about 264.0103014805.

The spelling of 18401898 in words is "eighteen million, four hundred one thousand, eight hundred ninety-eight".