820894001 has 8 divisors (see below), whose sum is σ = 824469984. Its totient is φ = 817326720.

The previous prime is 820893991. The next prime is 820894003. The reversal of 820894001 is 100498028.

It is a happy number.

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 820894001 - 2¹⁸ = 820631857 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 (820894003) 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, 242561 + ... + 245921.

It is an arithmetic number, because the mean of its divisors is an integer number (103058748).

Almost surely, 2^820894001 is an apocalyptic number.

It is an amenable number.

820894001 is a deficient number, since it is larger than the sum of its proper divisors (3575983).

820894001 is a wasteful number, since it uses less digits than its factorization.

820894001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 820894001 is about 28651.2478087779. The cubic root of 820894001 is about 936.3301916751.

The spelling of 820894001 in words is "eight hundred twenty million, eight hundred ninety-four thousand, one".