399244361 has 2 divisors, whose sum is σ = 399244362. Its totient is φ = 399244360.

The previous prime is 399244343. The next prime is 399244369. The reversal of 399244361 is 163442993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392792761 + 6451600 = 19819^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 399244361 - 2⁶ = 399244297 is a prime.

It is equal to p_21297983 and since 399244361 and 21297983 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (399244369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199622180 + 199622181.

It is an arithmetic number, because the mean of its divisors is an integer number (199622181).

Almost surely, 2^399244361 is an apocalyptic number.

It is an amenable number.

399244361 is a deficient number, since it is larger than the sum of its proper divisors (1).

399244361 is an equidigital number, since it uses as much as digits as its factorization.

399244361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 399244361 is about 19981.1000948396. The cubic root of 399244361 is about 736.3420409489.

The spelling of 399244361 in words is "three hundred ninety-nine million, two hundred forty-four thousand, three hundred sixty-one".