399108097 has 4 divisors (see below), whose sum is σ = 399189060. Its totient is φ = 399027136.

The previous prime is 399108049. The next prime is 399108103. The reversal of 399108097 is 790801993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 790801993 = 1693 ⋅467101.

It can be written as a sum of positive squares in 2 ways, for example, as 331276401 + 67831696 = 18201^2 + 8236^2 .

It is a cyclic number.

It is not a de Polignac number, because 399108097 - 2¹⁵ = 399075329 is a prime.

It is a super-2 number, since 2×399108097² = 318574546181922818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399108797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32572 + ... + 43117.

It is an arithmetic number, because the mean of its divisors is an integer number (99797265).

Almost surely, 2^399108097 is an apocalyptic number.

It is an amenable number.

399108097 is a deficient number, since it is larger than the sum of its proper divisors (80963).

399108097 is an equidigital number, since it uses as much as digits as its factorization.

399108097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80962.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 399108097 is about 19977.6899815769. The cubic root of 399108097 is about 736.2582590691.

The spelling of 399108097 in words is "three hundred ninety-nine million, one hundred eight thousand, ninety-seven".