816986 has 8 divisors (see below), whose sum is σ = 1297620. Its totient is φ = 384448.

The previous prime is 816971. The next prime is 817013. The reversal of 816986 is 689618.

It can be written as a sum of positive squares in 2 ways, for example, as 609961 + 207025 = 781^2 + 455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×816986² = 1334932248392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11981 + ... + 12048.

2⁸¹⁶⁹⁸⁶ is an apocalyptic number.

816986 is a deficient number, since it is larger than the sum of its proper divisors (480634).

816986 is a wasteful number, since it uses less digits than its factorization.

816986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24048.

The product of its digits is 20736, while the sum is 38.

The square root of 816986 is about 903.8727786586. The cubic root of 816986 is about 93.4841976211.

The spelling of 816986 in words is "eight hundred sixteen thousand, nine hundred eighty-six".