1072796921 has 4 divisors (see below), whose sum is σ = 1226053632. Its totient is φ = 919540212.

The previous prime is 1072796911. The next prime is 1072796929. The reversal of 1072796921 is 1296972701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1072796921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1072796929) 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, 76628345 + ... + 76628358.

It is an arithmetic number, because the mean of its divisors is an integer number (306513408).

Almost surely, 2^1072796921 is an apocalyptic number.

It is an amenable number.

1072796921 is a deficient number, since it is larger than the sum of its proper divisors (153256711).

1072796921 is an equidigital number, since it uses as much as digits as its factorization.

1072796921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153256710.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1072796921 is about 32753.5787510312. The cubic root of 1072796921 is about 1023.6995352713.

The spelling of 1072796921 in words is "one billion, seventy-two million, seven hundred ninety-six thousand, nine hundred twenty-one".