1231542 has 48 divisors (see below), whose sum is σ = 3035760. Its totient is φ = 357696.

The previous prime is 1231513. The next prime is 1231547. The reversal of 1231542 is 2451321.

1231542 is a `hidden beast` number, since 123 + 1 + 542 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4308 + ... + 4584.

It is an arithmetic number, because the mean of its divisors is an integer number (63245).

2^1231542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517880).

1231542 is an abundant number, since it is smaller than the sum of its proper divisors (1804218).

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

1231542 is a wasteful number, since it uses less digits than its factorization.

1231542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 314 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 1231542 is about 1109.7486201839. The cubic root of 1231542 is about 107.1888823214.

Adding to 1231542 its reverse (2451321), we get a palindrome (3682863).

The spelling of 1231542 in words is "one million, two hundred thirty-one thousand, five hundred forty-two".