385913881 has 2 divisors, whose sum is σ = 385913882. Its totient is φ = 385913880.

The previous prime is 385913873. The next prime is 385913909. The reversal of 385913881 is 188319583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335219481 + 50694400 = 18309^2 + 7120^2 .

It is a cyclic number.

It is not a de Polignac number, because 385913881 - 2³ = 385913873 is a prime.

It is a super-2 number, since 2×385913881² = 297859047096964322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (385913831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192956940 + 192956941.

It is an arithmetic number, because the mean of its divisors is an integer number (192956941).

Almost surely, 2^385913881 is an apocalyptic number.

It is an amenable number.

385913881 is a deficient number, since it is larger than the sum of its proper divisors (1).

385913881 is an equidigital number, since it uses as much as digits as its factorization.

385913881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 385913881 is about 19644.6909112869. The cubic root of 385913881 is about 728.0537894734.

The spelling of 385913881 in words is "three hundred eighty-five million, nine hundred thirteen thousand, eight hundred eighty-one".