843400057 has 2 divisors, whose sum is σ = 843400058. Its totient is φ = 843400056.

The previous prime is 843400027. The next prime is 843400067. The reversal of 843400057 is 750004348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582932736 + 260467321 = 24144^2 + 16139^2 .

It is a cyclic number.

It is not a de Polignac number, because 843400057 - 2⁷ = 843399929 is a prime.

It is a super-2 number, since 2×843400057² = 1422647312295206498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (843400027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421700028 + 421700029.

It is an arithmetic number, because the mean of its divisors is an integer number (421700029).

Almost surely, 2^843400057 is an apocalyptic number.

It is an amenable number.

843400057 is a deficient number, since it is larger than the sum of its proper divisors (1).

843400057 is an equidigital number, since it uses as much as digits as its factorization.

843400057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 843400057 is about 29041.3508122470. The cubic root of 843400057 is about 944.8101321559.

The spelling of 843400057 in words is "eight hundred forty-three million, four hundred thousand, fifty-seven".