1722928 has 20 divisors (see below), whose sum is σ = 3359160. Its totient is φ = 856064.

The previous prime is 1722923. The next prime is 1722937. The reversal of 1722928 is 8292271.

It is a self number, because there is not a number n which added to its sum of digits gives 1722928.

It is not an unprimeable number, because it can be changed into a prime (1722923) 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, 3903 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (167958).

2^1722928 is an apocalyptic number.

It is an amenable number.

1722928 is a deficient number, since it is larger than the sum of its proper divisors (1636232).

1722928 is a wasteful number, since it uses less digits than its factorization.

1722928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 678 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 1722928 is about 1312.6035197271. The cubic root of 1722928 is about 119.8824775341.

The spelling of 1722928 in words is "one million, seven hundred twenty-two thousand, nine hundred twenty-eight".