401220420 has 48 divisors (see below), whose sum is σ = 1127434560. Its totient is φ = 106609536.

The previous prime is 401220419. The next prime is 401220427. The reversal of 401220420 is 24022104.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 401220420.

It is not an unprimeable number, because it can be changed into a prime (401220427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5166 + ... + 28794.

It is an arithmetic number, because the mean of its divisors is an integer number (23488220).

Almost surely, 2^401220420 is an apocalyptic number.

It is an amenable number.

401220420 is an abundant number, since it is smaller than the sum of its proper divisors (726214140).

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

401220420 is a wasteful number, since it uses less digits than its factorization.

401220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23924 (or 23922 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 401220420 is about 20030.4872631696. The cubic root of 401220420 is about 737.5548832085.

Adding to 401220420 its reverse (24022104), we get a palindrome (425242524).

The spelling of 401220420 in words is "four hundred one million, two hundred twenty thousand, four hundred twenty".