399652469 has 4 divisors (see below), whose sum is σ = 401311020. Its totient is φ = 397993920.

The previous prime is 399652459. The next prime is 399652471. The reversal of 399652469 is 964256993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 964256993 = 7 ⋅137750999.

It can be written as a sum of positive squares in 2 ways, for example, as 124590244 + 275062225 = 11162^2 + 16585^2 .

It is a cyclic number.

It is not a de Polignac number, because 399652469 - 2¹⁶ = 399586933 is a prime.

It is a super-2 number, since 2×399652469² = 319444191955591922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399652469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399652459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828914 + ... + 829395.

It is an arithmetic number, because the mean of its divisors is an integer number (100327755).

Almost surely, 2^399652469 is an apocalyptic number.

It is an amenable number.

399652469 is a deficient number, since it is larger than the sum of its proper divisors (1658551).

399652469 is a wasteful number, since it uses less digits than its factorization.

399652469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658550.

The product of its digits is 3149280, while the sum is 53.

The square root of 399652469 is about 19991.3098370267. The cubic root of 399652469 is about 736.5928520413.

It can be divided in two parts, 3996 and 52469, that added together give a palindrome (56465).

The spelling of 399652469 in words is "three hundred ninety-nine million, six hundred fifty-two thousand, four hundred sixty-nine".