385136639 has 2 divisors, whose sum is σ = 385136640. Its totient is φ = 385136638.

The previous prime is 385136629. The next prime is 385136693. The reversal of 385136639 is 936631583.

Together with next prime (385136693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 385136639 - 2⁴ = 385136623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 385136639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385136629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192568319 + 192568320.

It is an arithmetic number, because the mean of its divisors is an integer number (192568320).

Almost surely, 2^385136639 is an apocalyptic number.

385136639 is a deficient number, since it is larger than the sum of its proper divisors (1).

385136639 is an equidigital number, since it uses as much as digits as its factorization.

385136639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 44.

The square root of 385136639 is about 19624.8984455971. The cubic root of 385136639 is about 727.5646869969.

The spelling of 385136639 in words is "three hundred eighty-five million, one hundred thirty-six thousand, six hundred thirty-nine".