400045522 has 4 divisors (see below), whose sum is σ = 600068286. Its totient is φ = 200022760.

The previous prime is 400045519. The next prime is 400045549. The reversal of 400045522 is 225540004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 248976841 + 151068681 = 15779^2 + 12291^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 400045493 and 400045502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100011379 + ... + 100011382.

Almost surely, 2^400045522 is an apocalyptic number.

400045522 is a deficient number, since it is larger than the sum of its proper divisors (200022764).

400045522 is a wasteful number, since it uses less digits than its factorization.

400045522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200022763.

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

The square root of 400045522 is about 20001.1380176229. The cubic root of 400045522 is about 736.8342494148.

Adding to 400045522 its reverse (225540004), we get a palindrome (625585526).

The spelling of 400045522 in words is "four hundred million, forty-five thousand, five hundred twenty-two".