401420840 has 64 divisors (see below), whose sum is σ = 951350400. Its totient is φ = 152140032.

The previous prime is 401420839. The next prime is 401420849. The reversal of 401420840 is 48024104.

It is a super-2 number, since 2×401420840² = 322277381572611200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (401420849) 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, 98279 + ... + 102281.

It is an arithmetic number, because the mean of its divisors is an integer number (14864850).

Almost surely, 2^401420840 is an apocalyptic number.

401420840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401420840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475675200).

401420840 is an abundant number, since it is smaller than the sum of its proper divisors (549929560).

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

401420840 is a wasteful number, since it uses less digits than its factorization.

401420840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 401420840 is about 20035.4895123628. The cubic root of 401420840 is about 737.6776720263.

Adding to 401420840 its reverse (48024104), we get a palindrome (449444944).

The spelling of 401420840 in words is "four hundred one million, four hundred twenty thousand, eight hundred forty".