1327790921 has 4 divisors (see below), whose sum is σ = 1327915392. Its totient is φ = 1327666452.

The previous prime is 1327790887. The next prime is 1327790957. The reversal of 1327790921 is 1290977231.

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 not a de Polignac number, because 1327790921 - 2⁶ = 1327790857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1327790521) 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, 44561 + ... + 68126.

It is an arithmetic number, because the mean of its divisors is an integer number (331978848).

Almost surely, 2^1327790921 is an apocalyptic number.

It is an amenable number.

1327790921 is a deficient number, since it is larger than the sum of its proper divisors (124471).

1327790921 is a wasteful number, since it uses less digits than its factorization.

1327790921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124470.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 1327790921 is about 36438.8655284437. The cubic root of 1327790921 is about 1099.1152447602.

The spelling of 1327790921 in words is "one billion, three hundred twenty-seven million, seven hundred ninety thousand, nine hundred twenty-one".