1979728 has 10 divisors (see below), whose sum is σ = 3835754. Its totient is φ = 989856.

The previous prime is 1979723. The next prime is 1979729. The reversal of 1979728 is 8279791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1882384 + 97344 = 1372^2 + 312^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61851 + ... + 61882.

2^1979728 is an apocalyptic number.

It is an amenable number.

1979728 is a deficient number, since it is larger than the sum of its proper divisors (1856026).

1979728 is a wasteful number, since it uses less digits than its factorization.

1979728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123741 (or 123735 counting only the distinct ones).

The product of its digits is 63504, while the sum is 43.

The square root of 1979728 is about 1407.0280736361. The cubic root of 1979728 is about 125.5649732612.

The spelling of 1979728 in words is "one million, nine hundred seventy-nine thousand, seven hundred twenty-eight".