1403840 has 56 divisors (see below), whose sum is σ = 3456432. Its totient is φ = 542720.

The previous prime is 1403833. The next prime is 1403849. The reversal of 1403840 is 483041.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

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

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1403849) 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, 13067 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (61722).

2^1403840 is an apocalyptic number.

1403840 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 1403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728216).

1403840 is an abundant number, since it is smaller than the sum of its proper divisors (2052592).

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

1403840 is a wasteful number, since it uses less digits than its factorization.

1403840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1403840 is about 1184.8375416064. The cubic root of 1403840 is about 111.9710809690.

Adding to 1403840 its reverse (483041), we get a palindrome (1886881).

The spelling of 1403840 in words is "one million, four hundred three thousand, eight hundred forty".