13941981 has 12 divisors (see below), whose sum is σ = 20273760. Its totient is φ = 9232200.

The previous prime is 13941973. The next prime is 13942003. The reversal of 13941981 is 18914931.

It is not a de Polignac number, because 13941981 - 2³ = 13941973 is a prime.

It is a super-2 number, since 2×13941981² = 388757668408722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13941931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3771 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1689480).

Almost surely, 2^13941981 is an apocalyptic number.

It is an amenable number.

13941981 is a deficient number, since it is larger than the sum of its proper divisors (6331779).

13941981 is a wasteful number, since it uses less digits than its factorization.

13941981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10416 (or 10413 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 13941981 is about 3733.8962224465. The cubic root of 13941981 is about 240.6808272332.

It can be divided in two parts, 1394 and 1981, that added together give a cube (3375 = 15³).

The spelling of 13941981 in words is "thirteen million, nine hundred forty-one thousand, nine hundred eighty-one".