1340724 has 48 divisors (see below), whose sum is σ = 3902976. Its totient is φ = 348000.

The previous prime is 1340723. The next prime is 1340743. The reversal of 1340724 is 4270431.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1340724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (81312).

2^1340724 is an apocalyptic number.

1340724 is a gapful number since it is divisible by the number (14) 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 1340724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1951488).

1340724 is an abundant number, since it is smaller than the sum of its proper divisors (2562252).

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

1340724 is a wasteful number, since it uses less digits than its factorization.

1340724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 1340724 is about 1157.8963684199. The cubic root of 1340724 is about 110.2672290679.

Subtracting from 1340724 its sum of digits (21), we obtain a triangular number (1340703 = T₁₆₃₇).

It can be divided in two parts, 13407 and 24, that added together give a palindrome (13431).

The spelling of 1340724 in words is "one million, three hundred forty thousand, seven hundred twenty-four".