400042522 has 8 divisors (see below), whose sum is σ = 654615072. Its totient is φ = 181837500.

The previous prime is 400042493. The next prime is 400042523. The reversal of 400042522 is 225240004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400042522.

It is not an unprimeable number, because it can be changed into a prime (400042523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091854 + ... + 9091897.

It is an arithmetic number, because the mean of its divisors is an integer number (81826884).

Almost surely, 2^400042522 is an apocalyptic number.

400042522 is a deficient number, since it is larger than the sum of its proper divisors (254572550).

400042522 is a wasteful number, since it uses less digits than its factorization.

400042522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18183764.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 400042522 is about 20001.0630217496. The cubic root of 400042522 is about 736.8324075342.

Adding to 400042522 its reverse (225240004), we get a palindrome (625282526).

The spelling of 400042522 in words is "four hundred million, forty-two thousand, five hundred twenty-two".