1242283857 has 16 divisors (see below), whose sum is σ = 1755987840. Its totient is φ = 778505472.

The previous prime is 1242283841. The next prime is 1242283871. The reversal of 1242283857 is 7583822421.

1242283857 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1242283857 - 2⁴ = 1242283841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242283457) 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, 27588 + ... + 56970.

It is an arithmetic number, because the mean of its divisors is an integer number (109749240).

Almost surely, 2^1242283857 is an apocalyptic number.

1242283857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1242283857 is a deficient number, since it is larger than the sum of its proper divisors (513703983).

1242283857 is a wasteful number, since it uses less digits than its factorization.

1242283857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30232.

The product of its digits is 215040, while the sum is 42.

The square root of 1242283857 is about 35246.0473954173. The cubic root of 1242283857 is about 1074.9962450202.

The spelling of 1242283857 in words is "one billion, two hundred forty-two million, two hundred eighty-three thousand, eight hundred fifty-seven".