400022420 has 24 divisors (see below), whose sum is σ = 960054144. Its totient is φ = 137150496.

The previous prime is 400022309. The next prime is 400022443. The reversal of 400022420 is 24220004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 400022395 and 400022404.

It is a congruent number.

It is an unprimeable number.

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, 1428512 + ... + 1428791.

It is an arithmetic number, because the mean of its divisors is an integer number (40002256).

Almost surely, 2^400022420 is an apocalyptic number.

It is an amenable number.

400022420 is an abundant number, since it is smaller than the sum of its proper divisors (560031724).

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

400022420 is a wasteful number, since it uses less digits than its factorization.

400022420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857319 (or 2857317 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400022420 is about 20000.5604921462. The cubic root of 400022420 is about 736.8200654686.

Adding to 400022420 its reverse (24220004), we get a palindrome (424242424).

The spelling of 400022420 in words is "four hundred million, twenty-two thousand, four hundred twenty".