1340424 has 24 divisors (see below), whose sum is σ = 3630510. Its totient is φ = 446784.

The previous prime is 1340419. The next prime is 1340441. The reversal of 1340424 is 4240431.

It can be written as a sum of positive squares in only one way, i.e., 777924 + 562500 = 882^2 + 750^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 1340397 and 1340406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9237 + ... + 9380.

2^1340424 is an apocalyptic number.

It is an amenable number.

1340424 is an abundant number, since it is smaller than the sum of its proper divisors (2290086).

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

1340424 is a wasteful number, since it uses less digits than its factorization.

1340424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18629 (or 18622 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1340424 is about 1157.7668159003. The cubic root of 1340424 is about 110.2590040003.

Adding to 1340424 its reverse (4240431), we get a palindrome (5580855).

It can be divided in two parts, 1340 and 424, that added together give a square (1764 = 42²).

The spelling of 1340424 in words is "one million, three hundred forty thousand, four hundred twenty-four".