13891028 has 6 divisors (see below), whose sum is σ = 24309306. Its totient is φ = 6945512.

The previous prime is 13890973. The next prime is 13891037. The reversal of 13891028 is 82019831.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 1373584 = 3538^2 + 1172^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13890985 and 13891003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1736375 + ... + 1736382.

It is an arithmetic number, because the mean of its divisors is an integer number (4051551).

Almost surely, 2^13891028 is an apocalyptic number.

It is an amenable number.

13891028 is a deficient number, since it is larger than the sum of its proper divisors (10418278).

13891028 is a wasteful number, since it uses less digits than its factorization.

13891028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472761 (or 3472759 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 13891028 is about 3727.0669433215. The cubic root of 13891028 is about 240.3872682794.

The spelling of 13891028 in words is "thirteen million, eight hundred ninety-one thousand, twenty-eight".