409969639 has 2 divisors, whose sum is σ = 409969640. Its totient is φ = 409969638.

The previous prime is 409969597. The next prime is 409969643. The reversal of 409969639 is 936969904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409969639 - 2¹⁵ = 409936871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 409969639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409969039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204984819 + 204984820.

It is an arithmetic number, because the mean of its divisors is an integer number (204984820).

Almost surely, 2^409969639 is an apocalyptic number.

409969639 is a deficient number, since it is larger than the sum of its proper divisors (1).

409969639 is an equidigital number, since it uses as much as digits as its factorization.

409969639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 55.

The square root of 409969639 is about 20247.7070059797. The cubic root of 409969639 is about 742.8775462433.

The spelling of 409969639 in words is "four hundred nine million, nine hundred sixty-nine thousand, six hundred thirty-nine".