389139197 has 24 divisors (see below), whose sum is σ = 435977640. Its totient is φ = 345712640.

The previous prime is 389139193. The next prime is 389139199. The reversal of 389139197 is 791931983.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 2859481 + 386279716 = 1691^2 + 19654^2 .

It is not a de Polignac number, because 389139197 - 2² = 389139193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389139193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1384697 + ... + 1384977.

It is an arithmetic number, because the mean of its divisors is an integer number (18165735).

Almost surely, 2^389139197 is an apocalyptic number.

It is an amenable number.

389139197 is a deficient number, since it is larger than the sum of its proper divisors (46838443).

389139197 is a wasteful number, since it uses less digits than its factorization.

389139197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 380 counting only the distinct ones).

The product of its digits is 367416, while the sum is 50.

The square root of 389139197 is about 19726.6113917216. The cubic root of 389139197 is about 730.0764272268.

The spelling of 389139197 in words is "three hundred eighty-nine million, one hundred thirty-nine thousand, one hundred ninety-seven".