809240921 has 8 divisors (see below), whose sum is σ = 817296480. Its totient is φ = 801224992.

The previous prime is 809240917. The next prime is 809240933. The reversal of 809240921 is 129042908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 809240921 - 2² = 809240917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809240981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32006 + ... + 51408.

It is an arithmetic number, because the mean of its divisors is an integer number (102162060).

Almost surely, 2^809240921 is an apocalyptic number.

It is an amenable number.

809240921 is a deficient number, since it is larger than the sum of its proper divisors (8055559).

809240921 is a wasteful number, since it uses less digits than its factorization.

809240921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19815.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 809240921 is about 28447.1601570350. The cubic root of 809240921 is about 931.8784712783.

The spelling of 809240921 in words is "eight hundred nine million, two hundred forty thousand, nine hundred twenty-one".