311390 has 8 divisors (see below), whose sum is σ = 560520. Its totient is φ = 124552.

The previous prime is 311371. The next prime is 311393. The reversal of 311390 is 93113.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311393) by changing a digit.

311390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15560 + ... + 15579.

It is an arithmetic number, because the mean of its divisors is an integer number (70065).

2³¹¹³⁹⁰ is an apocalyptic number.

311390 is a deficient number, since it is larger than the sum of its proper divisors (249130).

311390 is a wasteful number, since it uses less digits than its factorization.

311390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31146.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 311390 is about 558.0232970047. The cubic root of 311390 is about 67.7799983347.

The spelling of 311390 in words is "three hundred eleven thousand, three hundred ninety".