39913789 has 2 divisors, whose sum is σ = 39913790. Its totient is φ = 39913788.

The previous prime is 39913777. The next prime is 39913793. The reversal of 39913789 is 98731993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32970564 + 6943225 = 5742^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 39913789 - 2¹¹ = 39911741 is a prime.

It is a super-2 number, since 2×39913789² = 3186221104673042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39913799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19956894 + 19956895.

It is an arithmetic number, because the mean of its divisors is an integer number (19956895).

Almost surely, 2^39913789 is an apocalyptic number.

It is an amenable number.

39913789 is a deficient number, since it is larger than the sum of its proper divisors (1).

39913789 is an equidigital number, since it uses as much as digits as its factorization.

39913789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 39913789 is about 6317.7360660287. The cubic root of 39913789 is about 341.7493147143.

The spelling of 39913789 in words is "thirty-nine million, nine hundred thirteen thousand, seven hundred eighty-nine".