311604 has 24 divisors (see below), whose sum is σ = 759360. Its totient is φ = 99264.

The previous prime is 311603. The next prime is 311609. The reversal of 311604 is 406113.

311604 = T₁₇₇ + T₁₇₈ + ... + T₁₉₄.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (31640).

2³¹¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

311604 is an abundant number, since it is smaller than the sum of its proper divisors (447756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311604 is a wasteful number, since it uses less digits than its factorization.

311604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 311604 is about 558.2150123384. The cubic root of 311604 is about 67.7955218455.

Adding to 311604 its reverse (406113), we get a palindrome (717717).

The spelling of 311604 in words is "three hundred eleven thousand, six hundred four".