817949 has 16 divisors (see below), whose sum is σ = 964224. Its totient is φ = 686400.

The previous prime is 817933. The next prime is 817951. The reversal of 817949 is 949718.

It is not a de Polignac number, because 817949 - 2⁴ = 817933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13379 + ... + 13439.

It is an arithmetic number, because the mean of its divisors is an integer number (60264).

2⁸¹⁷⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

817949 is a deficient number, since it is larger than the sum of its proper divisors (146275).

817949 is a wasteful number, since it uses less digits than its factorization.

817949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its digits is 18144, while the sum is 38.

The square root of 817949 is about 904.4053294845. The cubic root of 817949 is about 93.5209138495.

Subtracting 817949 from its reverse (949718), we obtain a square (131769 = 363²).

It can be divided in two parts, 8179 and 49, that added together give a palindrome (8228).

The spelling of 817949 in words is "eight hundred seventeen thousand, nine hundred forty-nine".