13881974399 has 4 divisors (see below), whose sum is σ = 13895059320. Its totient is φ = 13868889480.

The previous prime is 13881974377. The next prime is 13881974401. The reversal of 13881974399 is 99347918831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13881974399 - 2⁸ = 13881974143 is a prime.

It is a super-2 number, since 2×13881974399² (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 (13881974329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6540869 + ... + 6542990.

It is an arithmetic number, because the mean of its divisors is an integer number (3473764830).

Almost surely, 2^13881974399 is an apocalyptic number.

13881974399 is a deficient number, since it is larger than the sum of its proper divisors (13084921).

13881974399 is a wasteful number, since it uses less digits than its factorization.

13881974399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13084920.

The product of its digits is 11757312, while the sum is 62.

The spelling of 13881974399 in words is "thirteen billion, eight hundred eighty-one million, nine hundred seventy-four thousand, three hundred ninety-nine".