1242006505 has 8 divisors (see below), whose sum is σ = 1518529032. Its totient is φ = 974857728.

The previous prime is 1242006503. The next prime is 1242006511. The reversal of 1242006505 is 5056002421.

It can be written as a sum of positive squares in 4 ways, for example, as 37847104 + 1204159401 = 6152^2 + 34701^2 .

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 1242006505 - 2¹ = 1242006503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242006505.

It is not an unprimeable number, because it can be changed into a prime (1242006503) 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, 2343144 + ... + 2343673.

It is an arithmetic number, because the mean of its divisors is an integer number (189816129).

Almost surely, 2^1242006505 is an apocalyptic number.

It is an amenable number.

1242006505 is a deficient number, since it is larger than the sum of its proper divisors (276522527).

1242006505 is an equidigital number, since it uses as much as digits as its factorization.

1242006505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686875.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1242006505 is about 35242.1126636869. The cubic root of 1242006505 is about 1074.9162379300.

Adding to 1242006505 its reverse (5056002421), we get a palindrome (6298008926).

The spelling of 1242006505 in words is "one billion, two hundred forty-two million, six thousand, five hundred five".