39695521 has 2 divisors, whose sum is σ = 39695522. Its totient is φ = 39695520.

The previous prime is 39695483. The next prime is 39695543. The reversal of 39695521 is 12559693.

It is a happy number.

39695521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28772496 + 10923025 = 5364^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 39695521 - 2¹⁷ = 39564449 is a prime.

It is a super-2 number, since 2×39695521² = 3151468774922882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39695581) 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, 19847760 + 19847761.

It is an arithmetic number, because the mean of its divisors is an integer number (19847761).

Almost surely, 2^39695521 is an apocalyptic number.

It is an amenable number.

39695521 is a deficient number, since it is larger than the sum of its proper divisors (1).

39695521 is an equidigital number, since it uses as much as digits as its factorization.

39695521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 40.

The square root of 39695521 is about 6300.4381593664. The cubic root of 39695521 is about 341.1252252618.

The spelling of 39695521 in words is "thirty-nine million, six hundred ninety-five thousand, five hundred twenty-one".