389998786 has 24 divisors (see below), whose sum is σ = 625411260. Its totient is φ = 182175840.

The previous prime is 389998781. The next prime is 389998793. The reversal of 389998786 is 687899983.

It can be written as a sum of positive squares in 2 ways, for example, as 387499225 + 2499561 = 19685^2 + 1581^2 .

It is not an unprimeable number, because it can be changed into a prime (389998781) 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, 52240 + ... + 59236.

Almost surely, 2^389998786 is an apocalyptic number.

389998786 is a deficient number, since it is larger than the sum of its proper divisors (235412474).

389998786 is a wasteful number, since it uses less digits than its factorization.

389998786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7090 (or 7059 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 67.

The square root of 389998786 is about 19748.3869214678. The cubic root of 389998786 is about 730.6135993150.

The spelling of 389998786 in words is "three hundred eighty-nine million, nine hundred ninety-eight thousand, seven hundred eighty-six".