400022201820 has 48 divisors (see below), whose sum is σ = 1150334121888. Its totient is φ = 103789543680.

The previous prime is 400022201807. The next prime is 400022201833. The reversal of 400022201820 is 28102220004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400022201807) and next prime (400022201833).

It is a super-2 number, since 2×400022201820² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90092871 + ... + 90097310.

It is an arithmetic number, because the mean of its divisors is an integer number (23965294206).

Almost surely, 2^400022201820 is an apocalyptic number.

It is an amenable number.

400022201820 is an abundant number, since it is smaller than the sum of its proper divisors (750311920068).

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

400022201820 is a wasteful number, since it uses less digits than its factorization.

400022201820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180190230 (or 180190228 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 400022201820 its reverse (28102220004), we get a palindrome (428124421824).

The spelling of 400022201820 in words is "four hundred billion, twenty-two million, two hundred one thousand, eight hundred twenty".