1401440 has 48 divisors (see below), whose sum is σ = 3492720. Its totient is φ = 529920.

The previous prime is 1401437. The next prime is 1401443. The reversal of 1401440 is 441041.

It is an interprime number because it is at equal distance from previous prime (1401437) and next prime (1401443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2810 + ... + 3270.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2^1401440 is an apocalyptic number.

1401440 is a gapful number since it is divisible by the number (10) 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 1401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746360).

1401440 is an abundant number, since it is smaller than the sum of its proper divisors (2091280).

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

1401440 is a wasteful number, since it uses less digits than its factorization.

1401440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1401440 is about 1183.8243112895. The cubic root of 1401440 is about 111.9072361148.

Adding to 1401440 its reverse (441041), we get a palindrome (1842481).

The spelling of 1401440 in words is "one million, four hundred one thousand, four hundred forty".