816949 has 4 divisors (see below), whose sum is σ = 933664. Its totient is φ = 700236.

The previous prime is 816947. The next prime is 816961. The reversal of 816949 is 949618.

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, and also an emirpimes, since its reverse is a distinct semiprime: 949618 = 2 ⋅474809.

It is a cyclic number.

It is not a de Polignac number, because 816949 - 2¹ = 816947 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58347 + ... + 58360.

It is an arithmetic number, because the mean of its divisors is an integer number (233416).

2⁸¹⁶⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

816949 is a deficient number, since it is larger than the sum of its proper divisors (116715).

816949 is a wasteful number, since it uses less digits than its factorization.

816949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116714.

The product of its digits is 15552, while the sum is 37.

The square root of 816949 is about 903.8523109447. The cubic root of 816949 is about 93.4827863494.

The spelling of 816949 in words is "eight hundred sixteen thousand, nine hundred forty-nine".