400320745 has 16 divisors (see below), whose sum is σ = 526730688. Its totient is φ = 289656640.

The previous prime is 400320731. The next prime is 400320751. The reversal of 400320745 is 547023004.

It is not a de Polignac number, because 400320745 - 2¹⁵ = 400287977 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7639 + ... + 29308.

It is an arithmetic number, because the mean of its divisors is an integer number (32920668).

Almost surely, 2^400320745 is an apocalyptic number.

It is an amenable number.

400320745 is a deficient number, since it is larger than the sum of its proper divisors (126409943).

400320745 is a wasteful number, since it uses less digits than its factorization.

400320745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37160.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 400320745 is about 20008.0170181855. The cubic root of 400320745 is about 737.0031862260.

Adding to 400320745 its reverse (547023004), we get a palindrome (947343749).

The spelling of 400320745 in words is "four hundred million, three hundred twenty thousand, seven hundred forty-five".