400221819 has 12 divisors (see below), whose sum is σ = 579768696. Its totient is φ = 266043552.

The previous prime is 400221751. The next prime is 400221889. The reversal of 400221819 is 918122004.

It is not a de Polignac number, because 400221819 - 2⁹ = 400221307 is a prime.

It is a super-2 number, since 2×400221819² = 320355008807337522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400221792 and 400221801.

It is not an unprimeable number, because it can be changed into a prime (400221889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60954 + ... + 67199.

It is an arithmetic number, because the mean of its divisors is an integer number (48314058).

Almost surely, 2^400221819 is an apocalyptic number.

400221819 is a deficient number, since it is larger than the sum of its proper divisors (179546877).

400221819 is a wasteful number, since it uses less digits than its factorization.

400221819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128506 (or 128503 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 400221819 is about 20005.5447064058. The cubic root of 400221819 is about 736.9424725902.

The spelling of 400221819 in words is "four hundred million, two hundred twenty-one thousand, eight hundred nineteen".