389845690 has 32 divisors (see below), whose sum is σ = 776134800. Its totient is φ = 140050944.

The previous prime is 389845681. The next prime is 389845691. The reversal of 389845690 is 96548983.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 96648561 + 293197129 = 9831^2 + 17123^2 .

It is a super-2 number, since 2×389845690² = 303959324023152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (389845691) 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, 35715 + ... + 45334.

Almost surely, 2^389845690 is an apocalyptic number.

389845690 is a deficient number, since it is larger than the sum of its proper divisors (386289110).

389845690 is a wasteful number, since it uses less digits than its factorization.

389845690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81106.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 389845690 is about 19744.5103763046. The cubic root of 389845690 is about 730.5179847789.

The spelling of 389845690 in words is "three hundred eighty-nine million, eight hundred forty-five thousand, six hundred ninety".