401135220 has 96 divisors (see below), whose sum is σ = 1313692800. Its totient is φ = 101336832.

The previous prime is 401135191. The next prime is 401135233. The reversal of 401135220 is 22531104.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 401135193 and 401135202.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 9289 + ... + 29808.

It is an arithmetic number, because the mean of its divisors is an integer number (13684300).

Almost surely, 2^401135220 is an apocalyptic number.

It is an amenable number.

401135220 is an abundant number, since it is smaller than the sum of its proper divisors (912557580).

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

401135220 is a wasteful number, since it uses less digits than its factorization.

401135220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39134 (or 39126 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 401135220 is about 20028.3603922039. The cubic root of 401135220 is about 737.5026724025.

Adding to 401135220 its reverse (22531104), we get a palindrome (423666324).

The spelling of 401135220 in words is "four hundred one million, one hundred thirty-five thousand, two hundred twenty".