13978537 has 2 divisors, whose sum is σ = 13978538. Its totient is φ = 13978536.

The previous prime is 13978519. The next prime is 13978567. The reversal of 13978537 is 73587931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13682601 + 295936 = 3699^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 13978537 - 2¹¹ = 13976489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13978493 and 13978502.

It is not a weakly prime, because it can be changed into another prime (13978567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6989268 + 6989269.

It is an arithmetic number, because the mean of its divisors is an integer number (6989269).

Almost surely, 2^13978537 is an apocalyptic number.

It is an amenable number.

13978537 is a deficient number, since it is larger than the sum of its proper divisors (1).

13978537 is an equidigital number, since it uses as much as digits as its factorization.

13978537 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13978537 is about 3738.7881726570. The cubic root of 13978537 is about 240.8909994160.

The spelling of 13978537 in words is "thirteen million, nine hundred seventy-eight thousand, five hundred thirty-seven".