400278943 has 2 divisors, whose sum is σ = 400278944. Its totient is φ = 400278942.

The previous prime is 400278887. The next prime is 400278961. The reversal of 400278943 is 349872004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400278943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400278143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200139471 + 200139472.

It is an arithmetic number, because the mean of its divisors is an integer number (200139472).

Almost surely, 2^400278943 is an apocalyptic number.

400278943 is a deficient number, since it is larger than the sum of its proper divisors (1).

400278943 is an equidigital number, since it uses as much as digits as its factorization.

400278943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 400278943 is about 20006.9723596550. The cubic root of 400278943 is about 736.9775323972.

The spelling of 400278943 in words is "four hundred million, two hundred seventy-eight thousand, nine hundred forty-three".