1242423819 has 64 divisors (see below), whose sum is σ = 2282542080. Its totient is φ = 650384640.

The previous prime is 1242423773. The next prime is 1242423823. The reversal of 1242423819 is 9183242421.

It is not a de Polignac number, because 1242423819 - 2²⁰ = 1241375243 is a prime.

It is a super-2 number, since 2×1242423819² = 3087233892037089522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1242421819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 334764 + ... + 338454.

It is an arithmetic number, because the mean of its divisors is an integer number (35664720).

Almost surely, 2^1242423819 is an apocalyptic number.

1242423819 is a deficient number, since it is larger than the sum of its proper divisors (1040118261).

1242423819 is a wasteful number, since it uses less digits than its factorization.

1242423819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857 (or 3851 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1242423819 is about 35248.0328387273. The cubic root of 1242423819 is about 1075.0366150139.

The spelling of 1242423819 in words is "one billion, two hundred forty-two million, four hundred twenty-three thousand, eight hundred nineteen".