400040220 has 24 divisors (see below), whose sum is σ = 1120112784. Its totient is φ = 106677376.

The previous prime is 400040191. The next prime is 400040273. The reversal of 400040220 is 22040004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 400040196 and 400040205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3333609 + ... + 3333728.

It is an arithmetic number, because the mean of its divisors is an integer number (46671366).

Almost surely, 2^400040220 is an apocalyptic number.

It is an amenable number.

400040220 is an abundant number, since it is smaller than the sum of its proper divisors (720072564).

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

400040220 is a wasteful number, since it uses less digits than its factorization.

400040220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667349 (or 6667347 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400040220 is about 20001.0054747255. The cubic root of 400040220 is about 736.8309941916.

Adding to 400040220 its reverse (22040004), we get a palindrome (422080224).

The spelling of 400040220 in words is "four hundred million, forty thousand, two hundred twenty".