1240440 has 32 divisors (see below), whose sum is σ = 3721680. Its totient is φ = 330752.

The previous prime is 1240423. The next prime is 1240483. The reversal of 1240440 is 440421.

Added to its reverse (440421) it gives a triangular number (1680861 = T₁₈₃₃).

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, 5049 + ... + 5288.

2^1240440 is an apocalyptic number.

1240440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240440 is an abundant number, since it is smaller than the sum of its proper divisors (2481240).

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

1240440 is a wasteful number, since it uses less digits than its factorization.

1240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10351 (or 10347 counting only the distinct ones).

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

The square root of 1240440 is about 1113.7504208753. The cubic root of 1240440 is about 107.4464128089.

Adding to 1240440 its reverse (440421), we get a palindrome (1680861).

The spelling of 1240440 in words is "one million, two hundred forty thousand, four hundred forty".