399423371 has 2 divisors, whose sum is σ = 399423372. Its totient is φ = 399423370.

The previous prime is 399423341. The next prime is 399423389. The reversal of 399423371 is 173324993.

It is a strong prime.

It is an emirp because it is prime and its reverse (173324993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399423371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399423331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199711685 + 199711686.

It is an arithmetic number, because the mean of its divisors is an integer number (199711686).

Almost surely, 2^399423371 is an apocalyptic number.

399423371 is a deficient number, since it is larger than the sum of its proper divisors (1).

399423371 is an equidigital number, since it uses as much as digits as its factorization.

399423371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 41.

The square root of 399423371 is about 19985.5790759237. The cubic root of 399423371 is about 736.4520762274.

The spelling of 399423371 in words is "three hundred ninety-nine million, four hundred twenty-three thousand, three hundred seventy-one".