1231308 has 48 divisors (see below), whose sum is σ = 3441760. Its totient is φ = 378432.

The previous prime is 1231303. The next prime is 1231309. The reversal of 1231308 is 8031321.

It is a super-2 number, since 2×1231308² = 3032238781728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1231301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 966 + ... + 1842.

2^1231308 is an apocalyptic number.

1231308 is a gapful number since it is divisible by the number (18) 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 1231308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720880).

1231308 is an abundant number, since it is smaller than the sum of its proper divisors (2210452).

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

1231308 is a wasteful number, since it uses less digits than its factorization.

1231308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231308 is about 1109.6431858936. The cubic root of 1231308 is about 107.1820930586.

Adding to 1231308 its reverse (8031321), we get a palindrome (9262629).

It can be divided in two parts, 123 and 1308, that added together give a triangular number (1431 = T₅₃).

The spelling of 1231308 in words is "one million, two hundred thirty-one thousand, three hundred eight".