397888357 has 2 divisors, whose sum is σ = 397888358. Its totient is φ = 397888356.

The previous prime is 397888321. The next prime is 397888369. The reversal of 397888357 is 753888793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344510721 + 53377636 = 18561^2 + 7306^2 .

It is a cyclic number.

It is not a de Polignac number, because 397888357 - 2¹⁵ = 397855589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397888157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198944178 + 198944179.

It is an arithmetic number, because the mean of its divisors is an integer number (198944179).

Almost surely, 2^397888357 is an apocalyptic number.

It is an amenable number.

397888357 is a deficient number, since it is larger than the sum of its proper divisors (1).

397888357 is an equidigital number, since it uses as much as digits as its factorization.

397888357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 58.

The square root of 397888357 is about 19947.1390680468. The cubic root of 397888357 is about 735.5074515657.

The spelling of 397888357 in words is "three hundred ninety-seven million, eight hundred eighty-eight thousand, three hundred fifty-seven".