13891992 has 64 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 4293120.

The previous prime is 13891987. The next prime is 13891993. The reversal of 13891992 is 29919831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13891993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32017 + ... + 32447.

It is an arithmetic number, because the mean of its divisors is an integer number (583200).

Almost surely, 2^13891992 is an apocalyptic number.

13891992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13891992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18662400).

13891992 is an abundant number, since it is smaller than the sum of its proper divisors (23432808).

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

13891992 is a wasteful number, since it uses less digits than its factorization.

13891992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 532 counting only the distinct ones).

The product of its digits is 34992, while the sum is 42.

The square root of 13891992 is about 3727.1962652911. The cubic root of 13891992 is about 240.3928288942.

The spelling of 13891992 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred ninety-two".