1231000 has 32 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 492000.

The previous prime is 1230997. The next prime is 1231001. The reversal of 1231000 is 1321.

It is a super-2 number, since 2×1231000² = 3030722000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385 + ... + 1615.

It is an arithmetic number, because the mean of its divisors is an integer number (90090).

2^1231000 is an apocalyptic number.

1231000 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 1231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1441440).

1231000 is an abundant number, since it is smaller than the sum of its proper divisors (1651880).

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

1231000 is a wasteful number, since it uses less digits than its factorization.

1231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1231000 is about 1109.5043938624. The cubic root of 1231000 is about 107.1731554525.

Adding to 1231000 its reverse (1321), we get a palindrome (1232321).

The spelling of 1231000 in words is "one million, two hundred thirty-one thousand".