818949 has 4 divisors (see below), whose sum is σ = 1091936. Its totient is φ = 545964.

The previous prime is 818947. The next prime is 818959. The reversal of 818949 is 949818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 818949 - 2¹ = 818947 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

818949 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136489 + ... + 136494.

It is an arithmetic number, because the mean of its divisors is an integer number (272984).

2⁸¹⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

818949 is a deficient number, since it is larger than the sum of its proper divisors (272987).

818949 is a wasteful number, since it uses less digits than its factorization.

818949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272986.

The product of its digits is 20736, while the sum is 39.

The square root of 818949 is about 904.9580100756. The cubic root of 818949 is about 93.5590102866.

The spelling of 818949 in words is "eight hundred eighteen thousand, nine hundred forty-nine".