399879349 has 2 divisors, whose sum is σ = 399879350. Its totient is φ = 399879348.

The previous prime is 399879343. The next prime is 399879353. The reversal of 399879349 is 943978993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384434449 + 15444900 = 19607^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 399879349 - 2¹¹ = 399877301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399879343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199939674 + 199939675.

It is an arithmetic number, because the mean of its divisors is an integer number (199939675).

Almost surely, 2^399879349 is an apocalyptic number.

It is an amenable number.

399879349 is a deficient number, since it is larger than the sum of its proper divisors (1).

399879349 is an equidigital number, since it uses as much as digits as its factorization.

399879349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 61.

The square root of 399879349 is about 19996.9834975178. The cubic root of 399879349 is about 736.7322119312.

The spelling of 399879349 in words is "three hundred ninety-nine million, eight hundred seventy-nine thousand, three hundred forty-nine".