39290639 has 2 divisors, whose sum is σ = 39290640. Its totient is φ = 39290638.

The previous prime is 39290617. The next prime is 39290659. The reversal of 39290639 is 93609293.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39290639 - 2²⁰ = 38242063 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39290596 and 39290605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39290659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19645319 + 19645320.

It is an arithmetic number, because the mean of its divisors is an integer number (19645320).

Almost surely, 2^39290639 is an apocalyptic number.

39290639 is a deficient number, since it is larger than the sum of its proper divisors (1).

39290639 is an equidigital number, since it uses as much as digits as its factorization.

39290639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 39290639 is about 6268.2245492643. The cubic root of 39290639 is about 339.9614691053.

The spelling of 39290639 in words is "thirty-nine million, two hundred ninety thousand, six hundred thirty-nine".