399349441 has 2 divisors, whose sum is σ = 399349442. Its totient is φ = 399349440.

The previous prime is 399349427. The next prime is 399349453. The reversal of 399349441 is 144943993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304851600 + 94497841 = 17460^2 + 9721^2 .

It is an emirp because it is prime and its reverse (144943993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399349441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399349391 and 399349400.

It is not a weakly prime, because it can be changed into another prime (399349411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199674720 + 199674721.

It is an arithmetic number, because the mean of its divisors is an integer number (199674721).

Almost surely, 2^399349441 is an apocalyptic number.

It is an amenable number.

399349441 is a deficient number, since it is larger than the sum of its proper divisors (1).

399349441 is an equidigital number, since it uses as much as digits as its factorization.

399349441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 46.

The square root of 399349441 is about 19983.7294066948. The cubic root of 399349441 is about 736.4066363379.

The spelling of 399349441 in words is "three hundred ninety-nine million, three hundred forty-nine thousand, four hundred forty-one".