13987573 has 2 divisors, whose sum is σ = 13987574. Its totient is φ = 13987572.

The previous prime is 13987559. The next prime is 13987579. The reversal of 13987573 is 37578931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8427409 + 5560164 = 2903^2 + 2358^2 .

It is a cyclic number.

It is not a de Polignac number, because 13987573 - 2²¹ = 11890421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13987579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993786 + 6993787.

It is an arithmetic number, because the mean of its divisors is an integer number (6993787).

Almost surely, 2^13987573 is an apocalyptic number.

It is an amenable number.

13987573 is a deficient number, since it is larger than the sum of its proper divisors (1).

13987573 is an equidigital number, since it uses as much as digits as its factorization.

13987573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 13987573 is about 3739.9963903726. The cubic root of 13987573 is about 240.9428937885.

The spelling of 13987573 in words is "thirteen million, nine hundred eighty-seven thousand, five hundred seventy-three".