1403640 has 96 divisors (see below), whose sum is σ = 5222880. Its totient is φ = 320256.

The previous prime is 1403627. The next prime is 1403641. The reversal of 1403640 is 463041.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1403641) 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, 2242 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (54405).

2^1403640 is an apocalyptic number.

1403640 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 1403640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2611440).

1403640 is an abundant number, since it is smaller than the sum of its proper divisors (3819240).

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

1403640 is a wasteful number, since it uses less digits than its factorization.

1403640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1403640 is about 1184.7531388437. The cubic root of 1403640 is about 111.9657633450.

Adding to 1403640 its reverse (463041), we get a palindrome (1866681).

The spelling of 1403640 in words is "one million, four hundred three thousand, six hundred forty".