13999537 has 2 divisors, whose sum is σ = 13999538. Its totient is φ = 13999536.

The previous prime is 13999529. The next prime is 13999549. The reversal of 13999537 is 73599931.

It is the 1528-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13278736 + 720801 = 3644^2 + 849^2 .

It is a cyclic number.

It is not a de Polignac number, because 13999537 - 2³ = 13999529 is a prime.

It is not a weakly prime, because it can be changed into another prime (13999597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999768 + 6999769.

It is an arithmetic number, because the mean of its divisors is an integer number (6999769).

Almost surely, 2^13999537 is an apocalyptic number.

It is an amenable number.

13999537 is a deficient number, since it is larger than the sum of its proper divisors (1).

13999537 is an equidigital number, since it uses as much as digits as its factorization.

13999537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 46.

The square root of 13999537 is about 3741.5955152849. The cubic root of 13999537 is about 241.0115694933.

The spelling of 13999537 in words is "thirteen million, nine hundred ninety-nine thousand, five hundred thirty-seven".