1399728 has 60 divisors (see below), whose sum is σ = 3991064. Its totient is φ = 422400.

The previous prime is 1399721. The next prime is 1399733. The reversal of 1399728 is 8279931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5688 + ... + 5928.

2^1399728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1995532).

1399728 is an abundant number, since it is smaller than the sum of its proper divisors (2591336).

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

1399728 is a wasteful number, since it uses less digits than its factorization.

1399728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 257 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 1399728 is about 1183.1010100579. The cubic root of 1399728 is about 111.8616488962.

The spelling of 1399728 in words is "one million, three hundred ninety-nine thousand, seven hundred twenty-eight".