1404240 has 40 divisors (see below), whose sum is σ = 4353888. Its totient is φ = 374400.

The previous prime is 1404229. The next prime is 1404257. The reversal of 1404240 is 424041.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2686 + ... + 3165.

2^1404240 is an apocalyptic number.

1404240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1404240 is an abundant number, since it is smaller than the sum of its proper divisors (2949648).

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

1404240 is a wasteful number, since it uses less digits than its factorization.

1404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5867 (or 5861 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1404240 is about 1185.0063290970. The cubic root of 1404240 is about 111.9817147020.

Subtracting from 1404240 its sum of digits (15), we obtain a square (1404225 = 1185²).

Adding to 1404240 its reverse (424041), we get a palindrome (1828281).

The spelling of 1404240 in words is "one million, four hundred four thousand, two hundred forty".