400440745 has 4 divisors (see below), whose sum is σ = 480528900. Its totient is φ = 320352592.

The previous prime is 400440743. The next prime is 400440757. The reversal of 400440745 is 547044004.

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 242611776 + 157828969 = 15576^2 + 12563^2 .

It is a cyclic number.

It is not a de Polignac number, because 400440745 - 2¹ = 400440743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400440743) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 40044070 + ... + 40044079.

It is an arithmetic number, because the mean of its divisors is an integer number (120132225).

Almost surely, 2^400440745 is an apocalyptic number.

It is an amenable number.

400440745 is a deficient number, since it is larger than the sum of its proper divisors (80088155).

400440745 is an equidigital number, since it uses as much as digits as its factorization.

400440745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80088154.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 400440745 is about 20011.0155914186. The cubic root of 400440745 is about 737.0768201374.

Adding to 400440745 its reverse (547044004), we get a palindrome (947484749).

The spelling of 400440745 in words is "four hundred million, four hundred forty thousand, seven hundred forty-five".