311986 has 8 divisors (see below), whose sum is σ = 478080. Its totient is φ = 152628.

The previous prime is 311981. The next prime is 312007. The reversal of 311986 is 689113.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (311981) 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, 1566 + ... + 1753.

It is an arithmetic number, because the mean of its divisors is an integer number (59760).

2³¹¹⁹⁸⁶ is an apocalyptic number.

311986 is a deficient number, since it is larger than the sum of its proper divisors (166094).

311986 is a wasteful number, since it uses less digits than its factorization.

311986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368.

The product of its digits is 1296, while the sum is 28.

The square root of 311986 is about 558.5570695999. The cubic root of 311986 is about 67.8232143801.

The spelling of 311986 in words is "three hundred eleven thousand, nine hundred eighty-six".