397892839 has 2 divisors, whose sum is σ = 397892840. Its totient is φ = 397892838.

The previous prime is 397892821. The next prime is 397892849. The reversal of 397892839 is 938298793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397892839 - 2⁷ = 397892711 is a prime.

It is a super-3 number, since 3×397892839³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397892819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198946419 + 198946420.

It is an arithmetic number, because the mean of its divisors is an integer number (198946420).

Almost surely, 2^397892839 is an apocalyptic number.

397892839 is a deficient number, since it is larger than the sum of its proper divisors (1).

397892839 is an equidigital number, since it uses as much as digits as its factorization.

397892839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 58.

The square root of 397892839 is about 19947.2514146686. The cubic root of 397892839 is about 735.5102132549.

The spelling of 397892839 in words is "three hundred ninety-seven million, eight hundred ninety-two thousand, eight hundred thirty-nine".