39998537 has 2 divisors, whose sum is σ = 39998538. Its totient is φ = 39998536.

The previous prime is 39998533. The next prime is 39998561. The reversal of 39998537 is 73589993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39702601 + 295936 = 6301^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 39998537 - 2² = 39998533 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39998533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999268 + 19999269.

It is an arithmetic number, because the mean of its divisors is an integer number (19999269).

Almost surely, 2^39998537 is an apocalyptic number.

It is an amenable number.

39998537 is a deficient number, since it is larger than the sum of its proper divisors (1).

39998537 is an equidigital number, since it uses as much as digits as its factorization.

39998537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 53.

The square root of 39998537 is about 6324.4396589737. The cubic root of 39998537 is about 341.9910197932.

The spelling of 39998537 in words is "thirty-nine million, nine hundred ninety-eight thousand, five hundred thirty-seven".