399106577 has 2 divisors, whose sum is σ = 399106578. Its totient is φ = 399106576.

The previous prime is 399106559. The next prime is 399106627. The reversal of 399106577 is 775601993.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370793536 + 28313041 = 19256^2 + 5321^2 .

It is a cyclic number.

It is not a de Polignac number, because 399106577 - 2²⁴ = 382329361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399106507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199553288 + 199553289.

It is an arithmetic number, because the mean of its divisors is an integer number (199553289).

Almost surely, 2^399106577 is an apocalyptic number.

It is an amenable number.

399106577 is a deficient number, since it is larger than the sum of its proper divisors (1).

399106577 is an equidigital number, since it uses as much as digits as its factorization.

399106577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 357210, while the sum is 47.

The square root of 399106577 is about 19977.6519391044. The cubic root of 399106577 is about 736.2573243901.

The spelling of 399106577 in words is "three hundred ninety-nine million, one hundred six thousand, five hundred seventy-seven".