13931928 has 96 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 4323264.

The previous prime is 13931909. The next prime is 13931933. The reversal of 13931928 is 82913931.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 13931892 and 13931901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77743 + ... + 77921.

It is an arithmetic number, because the mean of its divisors is an integer number (421200).

Almost surely, 2^13931928 is an apocalyptic number.

13931928 is a gapful number since it is divisible by the number (18) 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 13931928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20217600).

13931928 is an abundant number, since it is smaller than the sum of its proper divisors (26503272).

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

13931928 is a wasteful number, since it uses less digits than its factorization.

13931928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 254 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 13931928 is about 3732.5497987301. The cubic root of 13931928 is about 240.6229649122.

It can be divided in two parts, 1393 and 1928, that added together give a triangular number (3321 = T₈₁).

The spelling of 13931928 in words is "thirteen million, nine hundred thirty-one thousand, nine hundred twenty-eight".