1311800 has 48 divisors (see below), whose sum is σ = 3489360. Its totient is φ = 449280.

The previous prime is 1311799. The next prime is 1311829. The reversal of 1311800 is 81131.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 932 + ... + 1868.

It is an arithmetic number, because the mean of its divisors is an integer number (72695).

2^1311800 is an apocalyptic number.

1311800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744680).

1311800 is an abundant number, since it is smaller than the sum of its proper divisors (2177560).

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

1311800 is a wasteful number, since it uses less digits than its factorization.

1311800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1311800 is about 1145.3383779478. The cubic root of 1311800 is about 109.4685105063.

Adding to 1311800 its reverse (81131), we get a palindrome (1392931).

The spelling of 1311800 in words is "one million, three hundred eleven thousand, eight hundred".