399975013 has 2 divisors, whose sum is σ = 399975014. Its totient is φ = 399975012.

The previous prime is 399974999. The next prime is 399975019. The reversal of 399975013 is 310579993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366416164 + 33558849 = 19142^2 + 5793^2 .

It is an emirp because it is prime and its reverse (310579993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399975013 - 2¹³ = 399966821 is a prime.

It is a super-2 number, since 2×399975013² = 319960022048700338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399975019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199987506 + 199987507.

It is an arithmetic number, because the mean of its divisors is an integer number (199987507).

Almost surely, 2^399975013 is an apocalyptic number.

It is an amenable number.

399975013 is a deficient number, since it is larger than the sum of its proper divisors (1).

399975013 is an equidigital number, since it uses as much as digits as its factorization.

399975013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 46.

The square root of 399975013 is about 19999.3753152442. The cubic root of 399975013 is about 736.7909572594.

The spelling of 399975013 in words is "three hundred ninety-nine million, nine hundred seventy-five thousand, thirteen".