817880425 has 24 divisors (see below), whose sum is σ = 1040317344. Its totient is φ = 637512960.

The previous prime is 817880411. The next prime is 817880447. The reversal of 817880425 is 524088718.

It is a de Polignac number, because none of the positive numbers 2^k-817880425 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 636834 + ... + 638116.

It is an arithmetic number, because the mean of its divisors is an integer number (43346556).

Almost surely, 2^817880425 is an apocalyptic number.

It is an amenable number.

817880425 is a deficient number, since it is larger than the sum of its proper divisors (222436919).

817880425 is a wasteful number, since it uses less digits than its factorization.

817880425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 43.

The square root of 817880425 is about 28598.6087948348. The cubic root of 817880425 is about 935.1830024897.

The spelling of 817880425 in words is "eight hundred seventeen million, eight hundred eighty thousand, four hundred twenty-five".