400240052 has 6 divisors (see below), whose sum is σ = 700420098. Its totient is φ = 200120024.

The previous prime is 400240033. The next prime is 400240081. The reversal of 400240052 is 250042004.

It can be written as a sum of positive squares in only one way, i.e., 400240036 + 16 = 20006^2 + 4^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400240052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50030003 + ... + 50030010.

It is an arithmetic number, because the mean of its divisors is an integer number (116736683).

Almost surely, 2^400240052 is an apocalyptic number.

It is an amenable number.

400240052 is a deficient number, since it is larger than the sum of its proper divisors (300180046).

400240052 is a wasteful number, since it uses less digits than its factorization.

400240052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100060017 (or 100060015 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400240052 is about 20006.0003998800. Note that the first 3 decimals coincide. The cubic root of 400240052 is about 736.9536634411.

Adding to 400240052 its reverse (250042004), we get a palindrome (650282056).

The spelling of 400240052 in words is "four hundred million, two hundred forty thousand, fifty-two".