785422921 has 8 divisors (see below), whose sum is σ = 812827080. Its totient is φ = 758040192.

The previous prime is 785422909. The next prime is 785422961. The reversal of 785422921 is 129224587.

It can be written as a sum of positive squares in 4 ways, for example, as 147355321 + 638067600 = 12139^2 + 25260^2 .

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 785422921 - 2⁵ = 785422889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (785422961) 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, 116581 + ... + 123133.

It is an arithmetic number, because the mean of its divisors is an integer number (101603385).

Almost surely, 2^785422921 is an apocalyptic number.

It is an amenable number.

785422921 is a deficient number, since it is larger than the sum of its proper divisors (27404159).

785422921 is a wasteful number, since it uses less digits than its factorization.

785422921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715.

The product of its digits is 80640, while the sum is 40.

The square root of 785422921 is about 28025.3977848665. The cubic root of 785422921 is about 922.6447687647.

The spelling of 785422921 in words is "seven hundred eighty-five million, four hundred twenty-two thousand, nine hundred twenty-one".