385438731 has 32 divisors (see below), whose sum is σ = 559238400. Its totient is φ = 235301760.

The previous prime is 385438727. The next prime is 385438747. The reversal of 385438731 is 137834583.

It is not a de Polignac number, because 385438731 - 2² = 385438727 is a prime.

It is a super-2 number, since 2×385438731² = 297126030709780722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (385438721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377001 + ... + 378021.

It is an arithmetic number, because the mean of its divisors is an integer number (17476200).

Almost surely, 2^385438731 is an apocalyptic number.

385438731 is a deficient number, since it is larger than the sum of its proper divisors (173799669).

385438731 is a wasteful number, since it uses less digits than its factorization.

385438731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259.

The product of its digits is 241920, while the sum is 42.

The square root of 385438731 is about 19632.5935882145. The cubic root of 385438731 is about 727.7548654148.

It can be divided in two parts, 38543 and 8731, that added together give a palindrome (47274).

The spelling of 385438731 in words is "three hundred eighty-five million, four hundred thirty-eight thousand, seven hundred thirty-one".