18399949401 has 8 divisors (see below), whose sum is σ = 24607385824. Its totient is φ = 12229572960.

The previous prime is 18399949369. The next prime is 18399949411. The reversal of 18399949401 is 10494999381.

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

It is not a de Polignac number, because 18399949401 - 2⁵ = 18399949369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18399949411) 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, 9263836 + ... + 9265821.

It is an arithmetic number, because the mean of its divisors is an integer number (3075923228).

Almost surely, 2^18399949401 is an apocalyptic number.

It is an amenable number.

18399949401 is a deficient number, since it is larger than the sum of its proper divisors (6207436423).

18399949401 is a wasteful number, since it uses less digits than its factorization.

18399949401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18529991.

The product of its (nonzero) digits is 2519424, while the sum is 57.

The spelling of 18399949401 in words is "eighteen billion, three hundred ninety-nine million, nine hundred forty-nine thousand, four hundred one".