1340728 has 16 divisors (see below), whose sum is σ = 2601000. Its totient is φ = 647136.

The previous prime is 1340723. The next prime is 1340743. The reversal of 1340728 is 8270431.

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 3 ways as a sum of consecutive naturals, for example, 2658 + ... + 3121.

2^1340728 is an apocalyptic number.

It is an amenable number.

1340728 is a deficient number, since it is larger than the sum of its proper divisors (1260272).

1340728 is a wasteful number, since it uses less digits than its factorization.

1340728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814 (or 5810 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1340728 is about 1157.8980956889. The cubic root of 1340728 is about 110.2673387271.

Subtracting from 1340728 its sum of digits (25), we obtain a triangular number (1340703 = T₁₆₃₇).

The spelling of 1340728 in words is "one million, three hundred forty thousand, seven hundred twenty-eight".