385866391 has 16 divisors (see below), whose sum is σ = 421226784. Its totient is φ = 352041984.

The previous prime is 385866389. The next prime is 385866401. The reversal of 385866391 is 193668583.

It is not a de Polignac number, because 385866391 - 2¹ = 385866389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385866191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98221 + ... + 102073.

It is an arithmetic number, because the mean of its divisors is an integer number (26326674).

Almost surely, 2^385866391 is an apocalyptic number.

385866391 is a deficient number, since it is larger than the sum of its proper divisors (35360393).

385866391 is a wasteful number, since it uses less digits than its factorization.

385866391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050.

The product of its digits is 933120, while the sum is 49.

The square root of 385866391 is about 19643.4821505761. The cubic root of 385866391 is about 728.0239238354.

The spelling of 385866391 in words is "three hundred eighty-five million, eight hundred sixty-six thousand, three hundred ninety-one".