399954943 has 2 divisors, whose sum is σ = 399954944. Its totient is φ = 399954942.

The previous prime is 399954881. The next prime is 399954953. The reversal of 399954943 is 349459993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399954943 - 2¹⁷ = 399823871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399954953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199977471 + 199977472.

It is an arithmetic number, because the mean of its divisors is an integer number (199977472).

Almost surely, 2^399954943 is an apocalyptic number.

399954943 is a deficient number, since it is larger than the sum of its proper divisors (1).

399954943 is an equidigital number, since it uses as much as digits as its factorization.

399954943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 55.

The square root of 399954943 is about 19998.8735432774. The cubic root of 399954943 is about 736.7786334547.

The spelling of 399954943 in words is "three hundred ninety-nine million, nine hundred fifty-four thousand, nine hundred forty-three".