400343197 has 2 divisors, whose sum is σ = 400343198. Its totient is φ = 400343196.

The previous prime is 400343191. The next prime is 400343239. The reversal of 400343197 is 791343004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274432356 + 125910841 = 16566^2 + 11221^2 .

It is a cyclic number.

It is not a de Polignac number, because 400343197 - 2²⁷ = 266125469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400343191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200171598 + 200171599.

It is an arithmetic number, because the mean of its divisors is an integer number (200171599).

Almost surely, 2^400343197 is an apocalyptic number.

It is an amenable number.

400343197 is a deficient number, since it is larger than the sum of its proper divisors (1).

400343197 is an equidigital number, since it uses as much as digits as its factorization.

400343197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 400343197 is about 20008.5780854113. The cubic root of 400343197 is about 737.0169642497.

The spelling of 400343197 in words is "four hundred million, three hundred forty-three thousand, one hundred ninety-seven".