399607273 has 4 divisors (see below), whose sum is σ = 430346308. Its totient is φ = 368868240.

The previous prime is 399607249. The next prime is 399607291. The reversal of 399607273 is 372706993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140944384 + 258662889 = 11872^2 + 16083^2 .

It is not a de Polignac number, because 399607273 - 2¹⁷ = 399476201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399607223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15369498 + ... + 15369523.

It is an arithmetic number, because the mean of its divisors is an integer number (107586577).

Almost surely, 2^399607273 is an apocalyptic number.

It is an amenable number.

399607273 is a deficient number, since it is larger than the sum of its proper divisors (30739035).

399607273 is a wasteful number, since it uses less digits than its factorization.

399607273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30739034.

The product of its (nonzero) digits is 428652, while the sum is 46.

The square root of 399607273 is about 19990.1794139022. The cubic root of 399607273 is about 736.5650843280.

The spelling of 399607273 in words is "three hundred ninety-nine million, six hundred seven thousand, two hundred seventy-three".