1231992 has 48 divisors (see below), whose sum is σ = 3397680. Its totient is φ = 403200.

The previous prime is 1231987. The next prime is 1231999. The reversal of 1231992 is 2991321.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

Its product of digits (972) is a multiple of the sum of its prime factors (324).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4992 + ... + 5232.

It is an arithmetic number, because the mean of its divisors is an integer number (70785).

2^1231992 is an apocalyptic number.

1231992 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 1231992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1698840).

1231992 is an abundant number, since it is smaller than the sum of its proper divisors (2165688).

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

1231992 is a wasteful number, since it uses less digits than its factorization.

1231992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 317 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1231992 is about 1109.9513502852. The cubic root of 1231992 is about 107.2019361795.

It can be divided in two parts, 123199 and 2, that added together give a square (123201 = 351²).

The spelling of 1231992 in words is "one million, two hundred thirty-one thousand, nine hundred ninety-two".