1231872 has 44 divisors (see below), whose sum is σ = 3291576. Its totient is φ = 409600.

The previous prime is 1231859. The next prime is 1231873. The reversal of 1231872 is 2781321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1231873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872 + ... + 3272.

2^1231872 is an apocalyptic number.

1231872 is a gapful number since it is divisible by the number (12) 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 1231872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645788).

1231872 is an abundant number, since it is smaller than the sum of its proper divisors (2059704).

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

1231872 is an equidigital number, since it uses as much as digits as its factorization.

1231872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 406 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 1231872 is about 1109.8972925456. The cubic root of 1231872 is about 107.1984554615.

The spelling of 1231872 in words is "one million, two hundred thirty-one thousand, eight hundred seventy-two".