400002022 has 16 divisors (see below), whose sum is σ = 721808640. Its totient is φ = 162406728.

The previous prime is 400002019. The next prime is 400002023. The reversal of 400002022 is 220200004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400002023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751618 + ... + 752149.

It is an arithmetic number, because the mean of its divisors is an integer number (45113040).

Almost surely, 2^400002022 is an apocalyptic number.

400002022 is a deficient number, since it is larger than the sum of its proper divisors (321806618).

400002022 is a wasteful number, since it uses less digits than its factorization.

400002022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503795.

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400002022 is about 20000.0505499361. The cubic root of 400002022 is about 736.8075412446.

Adding to 400002022 its reverse (220200004), we get a palindrome (620202026).

The spelling of 400002022 in words is "four hundred million, two thousand, twenty-two".