1240728 has 32 divisors (see below), whose sum is σ = 3285360. Its totient is φ = 389120.

The previous prime is 1240717. The next prime is 1240739. The reversal of 1240728 is 8270421.

It is an interprime number because it is at equal distance from previous prime (1240717) and next prime (1240739).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1240698 and 1240707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113 + ... + 1928.

2^1240728 is an apocalyptic number.

It is an amenable number.

1240728 is an abundant number, since it is smaller than the sum of its proper divisors (2044632).

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

1240728 is a wasteful number, since it uses less digits than its factorization.

1240728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067 (or 3063 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1240728 is about 1113.8797062520. The cubic root of 1240728 is about 107.4547276467.

The spelling of 1240728 in words is "one million, two hundred forty thousand, seven hundred twenty-eight".