13891231440 has 120 divisors (see below), whose sum is σ = 48156346368. Its totient is φ = 3584828160.

The previous prime is 13891231439. The next prime is 13891231441. The reversal of 13891231440 is 4413219831.

13891231440 is a `hidden beast` number, since 1 + 389 + 1 + 231 + 4 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (13891231439) and next prime (13891231441).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13891231395 and 13891231404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891231441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288864 + ... + 333503.

Almost surely, 2^13891231440 is an apocalyptic number.

13891231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13891231440 is an abundant number, since it is smaller than the sum of its proper divisors (34265114928).

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

13891231440 is a wasteful number, since it uses less digits than its factorization.

13891231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622417 (or 622408 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 13891231440 in words is "thirteen billion, eight hundred ninety-one million, two hundred thirty-one thousand, four hundred forty".