401431820 has 24 divisors (see below), whose sum is σ = 863569728. Its totient is φ = 156656000.

The previous prime is 401431819. The next prime is 401431831. The reversal of 401431820 is 28134104.

It is a super-2 number, since 2×401431820² = 322295012217024800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 243956 + ... + 245595.

It is an arithmetic number, because the mean of its divisors is an integer number (35982072).

Almost surely, 2^401431820 is an apocalyptic number.

It is an amenable number.

401431820 is an abundant number, since it is smaller than the sum of its proper divisors (462137908).

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

401431820 is a wasteful number, since it uses less digits than its factorization.

401431820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489601 (or 489599 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 401431820 is about 20035.7635242583. The cubic root of 401431820 is about 737.6843978247.

Adding to 401431820 its reverse (28134104), we get a palindrome (429565924).

The spelling of 401431820 in words is "four hundred one million, four hundred thirty-one thousand, eight hundred twenty".