13987537 has 2 divisors, whose sum is σ = 13987538. Its totient is φ = 13987536.

The previous prime is 13987531. The next prime is 13987559. The reversal of 13987537 is 73578931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11350161 + 2637376 = 3369^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 13987537 - 2¹⁵ = 13954769 is a prime.

It is a super-3 number, since 3×13987537³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13987493 and 13987502.

It is not a weakly prime, because it can be changed into another prime (13987531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993768 + 6993769.

It is an arithmetic number, because the mean of its divisors is an integer number (6993769).

Almost surely, 2^13987537 is an apocalyptic number.

It is an amenable number.

13987537 is a deficient number, since it is larger than the sum of its proper divisors (1).

13987537 is an equidigital number, since it uses as much as digits as its factorization.

13987537 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 13987537 is about 3739.9915775306. The cubic root of 13987537 is about 240.9426870824.

The spelling of 13987537 in words is "thirteen million, nine hundred eighty-seven thousand, five hundred thirty-seven".