18949399399 has 8 divisors (see below), whose sum is σ = 22023515520. Its totient is φ = 15967048056.

The previous prime is 18949399397. The next prime is 18949399423. The reversal of 18949399399 is 99399394981.

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

It is a cyclic number.

It is not a de Polignac number, because 18949399399 - 2¹ = 18949399397 is a prime.

It is a super-2 number, since 2×18949399399² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949399397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22940749 + ... + 22941574.

It is an arithmetic number, because the mean of its divisors is an integer number (2752939440).

Almost surely, 2^18949399399 is an apocalyptic number.

18949399399 is a deficient number, since it is larger than the sum of its proper divisors (3074116121).

18949399399 is an equidigital number, since it uses as much as digits as its factorization.

18949399399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45882389.

The product of its digits is 153055008, while the sum is 73.

The spelling of 18949399399 in words is "eighteen billion, nine hundred forty-nine million, three hundred ninety-nine thousand, three hundred ninety-nine".