400422402 has 48 divisors (see below), whose sum is σ = 887927040. Its totient is φ = 130381056.

The previous prime is 400422391. The next prime is 400422409. The reversal of 400422402 is 204224004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (400422409) 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 23 ways as a sum of consecutive naturals, for example, 136483 + ... + 139385.

It is an arithmetic number, because the mean of its divisors is an integer number (18498480).

Almost surely, 2^400422402 is an apocalyptic number.

400422402 is an abundant number, since it is smaller than the sum of its proper divisors (487504638).

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

400422402 is a wasteful number, since it uses less digits than its factorization.

400422402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 400422402 is about 20010.5572636046. The cubic root of 400422402 is about 737.0655655330.

Adding to 400422402 its reverse (204224004), we get a palindrome (604646406).

The spelling of 400422402 in words is "four hundred million, four hundred twenty-two thousand, four hundred two".