1242540 has 120 divisors (see below), whose sum is σ = 4268880. Its totient is φ = 300672.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242540 is 452421.

1242540 is a `hidden beast` number, since 124 + 2 + 540 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21031 + ... + 21089.

It is an arithmetic number, because the mean of its divisors is an integer number (35574).

2^1242540 is an apocalyptic number.

1242540 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 1242540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2134440).

1242540 is an abundant number, since it is smaller than the sum of its proper divisors (3026340).

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

1242540 is a wasteful number, since it uses less digits than its factorization.

1242540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1242540 is about 1114.6927827882. The cubic root of 1242540 is about 107.5070123423.

Adding to 1242540 its reverse (452421), we get a palindrome (1694961).

The spelling of 1242540 in words is "one million, two hundred forty-two thousand, five hundred forty".