39390517 has 2 divisors, whose sum is σ = 39390518. Its totient is φ = 39390516.

The previous prime is 39390499. The next prime is 39390523. The reversal of 39390517 is 71509393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24690961 + 14699556 = 4969^2 + 3834^2 .

It is an emirp because it is prime and its reverse (71509393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39390517 - 2¹¹ = 39388469 is a prime.

It is a super-2 number, since 2×39390517² = 3103225659054578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39390317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19695258 + 19695259.

It is an arithmetic number, because the mean of its divisors is an integer number (19695259).

Almost surely, 2^39390517 is an apocalyptic number.

It is an amenable number.

39390517 is a deficient number, since it is larger than the sum of its proper divisors (1).

39390517 is an equidigital number, since it uses as much as digits as its factorization.

39390517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 39390517 is about 6276.1865013717. The cubic root of 39390517 is about 340.2492894935.

The spelling of 39390517 in words is "thirty-nine million, three hundred ninety thousand, five hundred seventeen".