1312440 has 32 divisors (see below), whose sum is σ = 3937680. Its totient is φ = 349952.

The previous prime is 1312411. The next prime is 1312459. The reversal of 1312440 is 442131.

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, 5349 + ... + 5588.

2^1312440 is an apocalyptic number.

1312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312440 is an abundant number, since it is smaller than the sum of its proper divisors (2625240).

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

1312440 is a wasteful number, since it uses less digits than its factorization.

1312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951 (or 10947 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1312440 is about 1145.6177372929. The cubic root of 1312440 is about 109.4863100835.

Adding to 1312440 its reverse (442131), we get a palindrome (1754571).

The spelling of 1312440 in words is "one million, three hundred twelve thousand, four hundred forty".