400388245 has 4 divisors (see below), whose sum is σ = 480465900. Its totient is φ = 320310592.

The previous prime is 400388243. The next prime is 400388257. The reversal of 400388245 is 542883004.

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 299947761 + 100440484 = 17319^2 + 10022^2 .

It is a cyclic number.

It is not a de Polignac number, because 400388245 - 2¹ = 400388243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400388245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400388243) 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, 40038820 + ... + 40038829.

It is an arithmetic number, because the mean of its divisors is an integer number (120116475).

Almost surely, 2^400388245 is an apocalyptic number.

It is an amenable number.

400388245 is a deficient number, since it is larger than the sum of its proper divisors (80077655).

400388245 is an equidigital number, since it uses as much as digits as its factorization.

400388245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80077654.

The product of its (nonzero) digits is 30720, while the sum is 34.

The square root of 400388245 is about 20009.7037709207. The cubic root of 400388245 is about 737.0446071115.

The spelling of 400388245 in words is "four hundred million, three hundred eighty-eight thousand, two hundred forty-five".