917820842 has 16 divisors (see below), whose sum is σ = 1438290432. Its totient is φ = 438438000.

The previous prime is 917820809. The next prime is 917820847. The reversal of 917820842 is 248028719.

It is a super-3 number, since 3×917820842³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 917820842.

It is not an unprimeable number, because it can be changed into a prime (917820847) 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 7 ways as a sum of consecutive naturals, for example, 28967 + ... + 51717.

It is an arithmetic number, because the mean of its divisors is an integer number (89893152).

Almost surely, 2^917820842 is an apocalyptic number.

917820842 is a deficient number, since it is larger than the sum of its proper divisors (520469590).

917820842 is a wasteful number, since it uses less digits than its factorization.

917820842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23653.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 917820842 is about 30295.5581232629. The cubic root of 917820842 is about 971.8203116106.

The spelling of 917820842 in words is "nine hundred seventeen million, eight hundred twenty thousand, eight hundred forty-two".