397989997351 has 2 divisors, whose sum is σ = 397989997352. Its totient is φ = 397989997350.

The previous prime is 397989997313. The next prime is 397989997481. The reversal of 397989997351 is 153799989793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 397989997351 - 2⁹ = 397989996839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397989994351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198994998675 + 198994998676.

It is an arithmetic number, because the mean of its divisors is an integer number (198994998676).

Almost surely, 2^397989997351 is an apocalyptic number.

397989997351 is a deficient number, since it is larger than the sum of its proper divisors (1).

397989997351 is an equidigital number, since it uses as much as digits as its factorization.

397989997351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1041624360, while the sum is 79.

The spelling of 397989997351 in words is "three hundred ninety-seven billion, nine hundred eighty-nine million, nine hundred ninety-seven thousand, three hundred fifty-one".