1242031809 has 16 divisors (see below), whose sum is σ = 1729096704. Its totient is φ = 791538000.

The previous prime is 1242031793. The next prime is 1242031831. The reversal of 1242031809 is 9081302421.

It is not a de Polignac number, because 1242031809 - 2⁴ = 1242031793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242031009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134284 + ... + 143234.

It is an arithmetic number, because the mean of its divisors is an integer number (108068544).

Almost surely, 2^1242031809 is an apocalyptic number.

It is an amenable number.

1242031809 is a deficient number, since it is larger than the sum of its proper divisors (487064895).

1242031809 is a wasteful number, since it uses less digits than its factorization.

1242031809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10988.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1242031809 is about 35242.4716641725. The cubic root of 1242031809 is about 1074.9235378102.

The spelling of 1242031809 in words is "one billion, two hundred forty-two million, thirty-one thousand, eight hundred nine".