385280639 has 6 divisors (see below), whose sum is σ = 409277664. Its totient is φ = 362616800.

The previous prime is 385280629. The next prime is 385280647. The reversal of 385280639 is 936082583.

It is not a de Polignac number, because 385280639 - 2¹² = 385276543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385280639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385280629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666287 + ... + 666864.

It is an arithmetic number, because the mean of its divisors is an integer number (68212944).

Almost surely, 2^385280639 is an apocalyptic number.

385280639 is a deficient number, since it is larger than the sum of its proper divisors (23997025).

385280639 is a wasteful number, since it uses less digits than its factorization.

385280639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333185 (or 1333168 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 385280639 is about 19628.5669115195. The cubic root of 385280639 is about 727.6553528797.

The spelling of 385280639 in words is "three hundred eighty-five million, two hundred eighty thousand, six hundred thirty-nine".