1161728 has 20 divisors (see below), whose sum is σ = 2322210. Its totient is φ = 580608.

The previous prime is 1161703. The next prime is 1161749. The reversal of 1161728 is 8271611.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 12544 = 1072^2 + 112^2 .

It is a super-2 number, since 2×1161728² = 2699223891968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1161697 and 1161706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623 + ... + 1646.

2^1161728 is an apocalyptic number.

It is an amenable number.

1161728 is a deficient number, since it is larger than the sum of its proper divisors (1160482).

1161728 is an frugal number, since it uses more digits than its factorization.

1161728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2287 (or 2271 counting only the distinct ones).

The product of its digits is 672, while the sum is 26.

The square root of 1161728 is about 1077.8348667584. The cubic root of 1161728 is about 105.1239051267.

The spelling of 1161728 in words is "one million, one hundred sixty-one thousand, seven hundred twenty-eight".