1242520 has 16 divisors (see below), whose sum is σ = 2795760. Its totient is φ = 496992.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242520 is 252421.

It is a junction number, because it is equal to n+sod(n) for n = 1242494 and 1242503.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15492 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (174735).

2^1242520 is an apocalyptic number.

1242520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242520 is an abundant number, since it is smaller than the sum of its proper divisors (1553240).

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

1242520 is a wasteful number, since it uses less digits than its factorization.

1242520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31074 (or 31070 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1242520 is about 1114.6838116704. The cubic root of 1242520 is about 107.5064355260.

Adding to 1242520 its reverse (252421), we get a palindrome (1494941).

Subtracting from 1242520 its reverse (252421), we obtain a palindrome (990099).

The spelling of 1242520 in words is "one million, two hundred forty-two thousand, five hundred twenty".