1931728 has 20 divisors (see below), whose sum is σ = 3771460. Its totient is φ = 958464.

The previous prime is 1931723. The next prime is 1931729. The reversal of 1931728 is 8271391.

It can be written as a sum of positive squares in 2 ways, for example, as 659344 + 1272384 = 812^2 + 1128^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1931728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931723) 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, 2128 + ... + 2896.

It is an arithmetic number, because the mean of its divisors is an integer number (188573).

2^1931728 is an apocalyptic number.

It is an amenable number.

1931728 is a deficient number, since it is larger than the sum of its proper divisors (1839732).

1931728 is a wasteful number, since it uses less digits than its factorization.

1931728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 928 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1931728 is about 1389.8661806088. The cubic root of 1931728 is about 124.5418535327.

The spelling of 1931728 in words is "one million, nine hundred thirty-one thousand, seven hundred twenty-eight".