817940925 has 36 divisors (see below), whose sum is σ = 1479569364. Its totient is φ = 431904000.

The previous prime is 817940923. The next prime is 817940947. The reversal of 817940925 is 529049718.

It can be written as a sum of positive squares in 6 ways, for example, as 109369764 + 708571161 = 10458^2 + 26619^2 .

It is not a de Polignac number, because 817940925 - 2¹ = 817940923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817940923) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4729 + ... + 40721.

It is an arithmetic number, because the mean of its divisors is an integer number (41099149).

Almost surely, 2^817940925 is an apocalyptic number.

It is an amenable number.

817940925 is a deficient number, since it is larger than the sum of its proper divisors (661628439).

817940925 is a wasteful number, since it uses less digits than its factorization.

817940925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36110 (or 36102 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 817940925 is about 28599.6665190348. Note that the first 3 decimals coincide. The cubic root of 817940925 is about 935.2060609446.

The spelling of 817940925 in words is "eight hundred seventeen million, nine hundred forty thousand, nine hundred twenty-five".