311842 has 4 divisors (see below), whose sum is σ = 467766. Its totient is φ = 155920.

The previous prime is 311827. The next prime is 311867. The reversal of 311842 is 248113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248113 = 47 ⋅5279.

It can be written as a sum of positive squares in only one way, i.e., 271441 + 40401 = 521^2 + 201^2 .

It is an unprimeable number.

311842 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 as a sum of consecutive naturals, namely, 77959 + ... + 77962.

2³¹¹⁸⁴² is an apocalyptic number.

311842 is a deficient number, since it is larger than the sum of its proper divisors (155924).

311842 is a wasteful number, since it uses less digits than its factorization.

311842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155923.

The product of its digits is 192, while the sum is 19.

The square root of 311842 is about 558.4281511529. The cubic root of 311842 is about 67.8127779654.

Adding to 311842 its reverse (248113), we get a palindrome (559955).

It can be divided in two parts, 3118 and 42, that added together give a triangular number (3160 = T₇₉).

The spelling of 311842 in words is "three hundred eleven thousand, eight hundred forty-two".