399240052 has 6 divisors (see below), whose sum is σ = 698670098. Its totient is φ = 199620024.

The previous prime is 399240031. The next prime is 399240119. The reversal of 399240052 is 250042993.

It can be written as a sum of positive squares in only one way, i.e., 288864016 + 110376036 = 16996^2 + 10506^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49905003 + ... + 49905010.

Almost surely, 2^399240052 is an apocalyptic number.

It is an amenable number.

399240052 is a deficient number, since it is larger than the sum of its proper divisors (299430046).

399240052 is a wasteful number, since it uses less digits than its factorization.

399240052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99810017 (or 99810015 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 399240052 is about 19980.9922676528. The cubic root of 399240052 is about 736.3393918535.

It can be divided in two parts, 3992 and 40052, that added together give a palindrome (44044).

The spelling of 399240052 in words is "three hundred ninety-nine million, two hundred forty thousand, fifty-two".