399273605 has 8 divisors (see below), whose sum is σ = 479677464. Its totient is φ = 319052800.

The previous prime is 399273593. The next prime is 399273607. The reversal of 399273605 is 506372993.

It can be written as a sum of positive squares in 4 ways, for example, as 48011041 + 351262564 = 6929^2 + 18742^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399273605 - 2⁸ = 399273349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399273607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40916 + ... + 49725.

It is an arithmetic number, because the mean of its divisors is an integer number (59959683).

Almost surely, 2^399273605 is an apocalyptic number.

It is an amenable number.

399273605 is a deficient number, since it is larger than the sum of its proper divisors (80403859).

399273605 is an equidigital number, since it uses as much as digits as its factorization.

399273605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91527.

The product of its (nonzero) digits is 306180, while the sum is 44.

The square root of 399273605 is about 19981.8318729790. The cubic root of 399273605 is about 736.3600191289.

The spelling of 399273605 in words is "three hundred ninety-nine million, two hundred seventy-three thousand, six hundred five".