13881994 has 12 divisors (see below), whose sum is σ = 24222834. Its totient is φ = 5949384.

The previous prime is 13881983. The next prime is 13881997. The reversal of 13881994 is 49918831.

13881994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 3286969 = 3255^2 + 1813^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13881994.

It is not an unprimeable number, because it can be changed into a prime (13881997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70729 + ... + 70924.

Almost surely, 2^13881994 is an apocalyptic number.

13881994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

13881994 is a deficient number, since it is larger than the sum of its proper divisors (10340840).

13881994 is a wasteful number, since it uses less digits than its factorization.

13881994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141669 (or 141662 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 13881994 is about 3725.8548012503. The cubic root of 13881994 is about 240.3351451985.

It can be divided in two parts, 1388 and 1994, that multiplied together give a palindrome (2767672).

The spelling of 13881994 in words is "thirteen million, eight hundred eighty-one thousand, nine hundred ninety-four".