400220545 has 16 divisors (see below), whose sum is σ = 513768528. Its totient is φ = 298229760.

The previous prime is 400220533. The next prime is 400220549. The reversal of 400220545 is 545022004.

It can be written as a sum of positive squares in 8 ways, for example, as 30658369 + 369562176 = 5537^2 + 19224^2 .

It is not a de Polignac number, because 400220545 - 2⁷ = 400220417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400220549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16026 + ... + 32515.

It is an arithmetic number, because the mean of its divisors is an integer number (32110533).

Almost surely, 2^400220545 is an apocalyptic number.

It is an amenable number.

400220545 is a deficient number, since it is larger than the sum of its proper divisors (113547983).

400220545 is a wasteful number, since it uses less digits than its factorization.

400220545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48660.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 400220545 is about 20005.5128652079. The cubic root of 400220545 is about 736.9416906358.

Adding to 400220545 its reverse (545022004), we get a palindrome (945242549).

The spelling of 400220545 in words is "four hundred million, two hundred twenty thousand, five hundred forty-five".