1242520005 has 8 divisors (see below), whose sum is σ = 1988032032. Its totient is φ = 662677328.

The previous prime is 1242520001. The next prime is 1242520009. The reversal of 1242520005 is 5000252421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1242520001) and next prime (1242520009).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242520005 - 2² = 1242520001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242520001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41417319 + ... + 41417348.

It is an arithmetic number, because the mean of its divisors is an integer number (248504004).

Almost surely, 2^1242520005 is an apocalyptic number.

1242520005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242520005 is a deficient number, since it is larger than the sum of its proper divisors (745512027).

1242520005 is an equidigital number, since it uses as much as digits as its factorization.

1242520005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82834675.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1242520005 is about 35249.3972288889. The cubic root of 1242520005 is about 1075.0643567024.

Adding to 1242520005 its reverse (5000252421), we get a palindrome (6242772426).

The spelling of 1242520005 in words is "one billion, two hundred forty-two million, five hundred twenty thousand, five".