401001220 has 24 divisors (see below), whose sum is σ = 852251904. Its totient is φ = 158467296.

The previous prime is 401001217. The next prime is 401001269. The reversal of 401001220 is 22100104.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 401001197 and 401001206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119124 + ... + 122443.

It is an arithmetic number, because the mean of its divisors is an integer number (35510496).

Almost surely, 2^401001220 is an apocalyptic number.

It is an amenable number.

401001220 is an abundant number, since it is smaller than the sum of its proper divisors (451250684).

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

401001220 is a wasteful number, since it uses less digits than its factorization.

401001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241659 (or 241657 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 401001220 is about 20025.0148564240. The cubic root of 401001220 is about 737.4205418560.

Adding to 401001220 its reverse (22100104), we get a palindrome (423101324).

The spelling of 401001220 in words is "four hundred one million, one thousand, two hundred twenty".