13961389 has 4 divisors (see below), whose sum is σ = 15035356. Its totient is φ = 12887424.

The previous prime is 13961359. The next prime is 13961399. The reversal of 13961389 is 98316931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98316931 = 29 ⋅3390239.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 13264164 = 835^2 + 3642^2 .

It is a cyclic number.

It is not a de Polignac number, because 13961389 - 2⁵ = 13961357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13961329) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 536964 + ... + 536989.

It is an arithmetic number, because the mean of its divisors is an integer number (3758839).

Almost surely, 2^13961389 is an apocalyptic number.

It is an amenable number.

13961389 is a deficient number, since it is larger than the sum of its proper divisors (1073967).

13961389 is a wasteful number, since it uses less digits than its factorization.

13961389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073966.

The product of its digits is 34992, while the sum is 40.

The square root of 13961389 is about 3736.4942124938. The cubic root of 13961389 is about 240.7924557428.

The spelling of 13961389 in words is "thirteen million, nine hundred sixty-one thousand, three hundred eighty-nine".