1242805869 has 8 divisors (see below), whose sum is σ = 1841193920. Its totient is φ = 828537228.

The previous prime is 1242805853. The next prime is 1242805873. The reversal of 1242805869 is 9685082421.

It is not a de Polignac number, because 1242805869 - 2⁴ = 1242805853 is a prime.

It is a super-2 number, since 2×1242805869² = 3089132856041690322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242805849) 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, 23014897 + ... + 23014950.

It is an arithmetic number, because the mean of its divisors is an integer number (230149240).

Almost surely, 2^1242805869 is an apocalyptic number.

It is an amenable number.

1242805869 is a deficient number, since it is larger than the sum of its proper divisors (598388051).

1242805869 is an equidigital number, since it uses as much as digits as its factorization.

1242805869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46029856 (or 46029850 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1242805869 is about 35253.4518735400. The cubic root of 1242805869 is about 1075.1467963226.

The spelling of 1242805869 in words is "one billion, two hundred forty-two million, eight hundred five thousand, eight hundred sixty-nine".