400341220 has 48 divisors (see below), whose sum is σ = 898708608. Its totient is φ = 149431040.

The previous prime is 400341199. The next prime is 400341283. The reversal of 400341220 is 22143004.

It is a junction number, because it is equal to n+sod(n) for n = 400341194 and 400341203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8247 + ... + 29473.

It is an arithmetic number, because the mean of its divisors is an integer number (18723096).

Almost surely, 2^400341220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400341220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449354304).

400341220 is an abundant number, since it is smaller than the sum of its proper divisors (498367388).

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

400341220 is a wasteful number, since it uses less digits than its factorization.

400341220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21300 (or 21298 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 400341220 is about 20008.5286815398. The cubic root of 400341220 is about 737.0157510532.

Adding to 400341220 its reverse (22143004), we get a palindrome (422484224).

The spelling of 400341220 in words is "four hundred million, three hundred forty-one thousand, two hundred twenty".