400012422 has 16 divisors (see below), whose sum is σ = 800558640. Its totient is φ = 133248512.

The previous prime is 400012387. The next prime is 400012423. The reversal of 400012422 is 224210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400012423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12147 + ... + 30782.

It is an arithmetic number, because the mean of its divisors is an integer number (50034915).

Almost surely, 2^400012422 is an apocalyptic number.

400012422 is an abundant number, since it is smaller than the sum of its proper divisors (400546218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400012422 is a wasteful number, since it uses less digits than its factorization.

400012422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44487.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400012422 is about 20000.3105475890. The cubic root of 400012422 is about 736.8139268223.

Adding to 400012422 its reverse (224210004), we get a palindrome (624222426).

The spelling of 400012422 in words is "four hundred million, twelve thousand, four hundred twenty-two".