389715561 has 12 divisors (see below), whose sum is σ = 578137092. Its totient is φ = 252788256.

The previous prime is 389715553. The next prime is 389715569. The reversal of 389715561 is 165517983.

It is a happy number.

389715561 is a `hidden beast` number, since 3 + 8 + 97 + 1 + 556 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (389715553) and next prime (389715569).

It can be written as a sum of positive squares in 2 ways, for example, as 351337536 + 38378025 = 18744^2 + 6195^2 .

It is not a de Polignac number, because 389715561 - 2³ = 389715553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (389715569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 584826 + ... + 585491.

It is an arithmetic number, because the mean of its divisors is an integer number (48178091).

Almost surely, 2^389715561 is an apocalyptic number.

It is an amenable number.

389715561 is a deficient number, since it is larger than the sum of its proper divisors (188421531).

389715561 is a wasteful number, since it uses less digits than its factorization.

389715561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170360 (or 1170357 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 389715561 is about 19741.2147802510. The cubic root of 389715561 is about 730.4366943638.

The spelling of 389715561 in words is "three hundred eighty-nine million, seven hundred fifteen thousand, five hundred sixty-one".