845927021 has 4 divisors (see below), whose sum is σ = 895687452. Its totient is φ = 796166592.

The previous prime is 845926999. The next prime is 845927029. The reversal of 845927021 is 120729548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 570732100 + 275194921 = 23890^2 + 16589^2 .

It is a cyclic number.

It is not a de Polignac number, because 845927021 - 2⁶ = 845926957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845927029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24880190 + ... + 24880223.

It is an arithmetic number, because the mean of its divisors is an integer number (223921863).

Almost surely, 2^845927021 is an apocalyptic number.

It is an amenable number.

845927021 is a deficient number, since it is larger than the sum of its proper divisors (49760431).

845927021 is a wasteful number, since it uses less digits than its factorization.

845927021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49760430.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 845927021 is about 29084.8245825895. The cubic root of 845927021 is about 945.7527930298.

The spelling of 845927021 in words is "eight hundred forty-five million, nine hundred twenty-seven thousand, twenty-one".