400943399 has 2 divisors, whose sum is σ = 400943400. Its totient is φ = 400943398.

The previous prime is 400943393. The next prime is 400943441. The reversal of 400943399 is 993349004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400943399 - 2⁸ = 400943143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400943393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200471699 + 200471700.

It is an arithmetic number, because the mean of its divisors is an integer number (200471700).

Almost surely, 2^400943399 is an apocalyptic number.

400943399 is a deficient number, since it is larger than the sum of its proper divisors (1).

400943399 is an equidigital number, since it uses as much as digits as its factorization.

400943399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 400943399 is about 20023.5710850987. The cubic root of 400943399 is about 737.3850968744.

The spelling of 400943399 in words is "four hundred million, nine hundred forty-three thousand, three hundred ninety-nine".