385575981 has 16 divisors (see below), whose sum is σ = 588177024. Its totient is φ = 220091904.

The previous prime is 385575977. The next prime is 385575989. The reversal of 385575981 is 189575583.

It is not a de Polignac number, because 385575981 - 2² = 385575977 is a prime.

It is a super-2 number, since 2×385575981² = 297337674248224722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385575989) 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, 11121 + ... + 29913.

It is an arithmetic number, because the mean of its divisors is an integer number (36761064).

Almost surely, 2^385575981 is an apocalyptic number.

It is an amenable number.

385575981 is a deficient number, since it is larger than the sum of its proper divisors (202601043).

385575981 is a wasteful number, since it uses less digits than its factorization.

385575981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19780.

The product of its digits is 1512000, while the sum is 51.

The square root of 385575981 is about 19636.0887398687. The cubic root of 385575981 is about 727.8412366880.

The spelling of 385575981 in words is "three hundred eighty-five million, five hundred seventy-five thousand, nine hundred eighty-one".