1091928392 has 8 divisors (see below), whose sum is σ = 2047365750. Its totient is φ = 545964192.

The previous prime is 1091928391. The next prime is 1091928443. The reversal of 1091928392 is 2938291901.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1019780356 + 72148036 = 31934^2 + 8494^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1091928392² = 2384615226511411328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1091928391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68245517 + ... + 68245532.

Almost surely, 2^1091928392 is an apocalyptic number.

It is an amenable number.

1091928392 is a deficient number, since it is larger than the sum of its proper divisors (955437358).

1091928392 is a wasteful number, since it uses less digits than its factorization.

1091928392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136491055 (or 136491051 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1091928392 is about 33044.3397876247. The cubic root of 1091928392 is about 1029.7490173028.

The spelling of 1091928392 in words is "one billion, ninety-one million, nine hundred twenty-eight thousand, three hundred ninety-two".