401043440 has 120 divisors (see below), whose sum is σ = 1091581920. Its totient is φ = 136625664.

The previous prime is 401043437. The next prime is 401043449. The reversal of 401043440 is 44340104.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401043449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1030766 + ... + 1031154.

It is an arithmetic number, because the mean of its divisors is an integer number (9096516).

Almost surely, 2^401043440 is an apocalyptic number.

401043440 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 401043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545790960).

401043440 is an abundant number, since it is smaller than the sum of its proper divisors (690538480).

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

401043440 is a wasteful number, since it uses less digits than its factorization.

401043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 401043440 is about 20026.0690101677. The cubic root of 401043440 is about 737.4464210813.

Adding to 401043440 its reverse (44340104), we get a palindrome (445383544).

The spelling of 401043440 in words is "four hundred one million, forty-three thousand, four hundred forty".