397789129 has 2 divisors, whose sum is σ = 397789130. Its totient is φ = 397789128.

The previous prime is 397789127. The next prime is 397789141. The reversal of 397789129 is 921987793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242113600 + 155675529 = 15560^2 + 12477^2 .

It is a cyclic number.

It is not a de Polignac number, because 397789129 - 2¹ = 397789127 is a prime.

Together with 397789127, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397789129.

It is not a weakly prime, because it can be changed into another prime (397789121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198894564 + 198894565.

It is an arithmetic number, because the mean of its divisors is an integer number (198894565).

Almost surely, 2^397789129 is an apocalyptic number.

It is an amenable number.

397789129 is a deficient number, since it is larger than the sum of its proper divisors (1).

397789129 is an equidigital number, since it uses as much as digits as its factorization.

397789129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 55.

The square root of 397789129 is about 19944.6516389733. The cubic root of 397789129 is about 735.4463045966.

The spelling of 397789129 in words is "three hundred ninety-seven million, seven hundred eighty-nine thousand, one hundred twenty-nine".