399179377 has 2 divisors, whose sum is σ = 399179378. Its totient is φ = 399179376.

The previous prime is 399179359. The next prime is 399179381. The reversal of 399179377 is 773971993.

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., 371679841 + 27499536 = 19279^2 + 5244^2 .

It is an emirp because it is prime and its reverse (773971993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399179377 - 2¹¹ = 399177329 is a prime.

It is not a weakly prime, because it can be changed into another prime (399179317) 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, 199589688 + 199589689.

It is an arithmetic number, because the mean of its divisors is an integer number (199589689).

Almost surely, 2^399179377 is an apocalyptic number.

It is an amenable number.

399179377 is a deficient number, since it is larger than the sum of its proper divisors (1).

399179377 is an equidigital number, since it uses as much as digits as its factorization.

399179377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250423, while the sum is 55.

The square root of 399179377 is about 19979.4738919722. The cubic root of 399179377 is about 736.3020879341.

It can be divided in two parts, 39917 and 9377, that added together give a palindrome (49294).

The spelling of 399179377 in words is "three hundred ninety-nine million, one hundred seventy-nine thousand, three hundred seventy-seven".