1242145756 has 12 divisors (see below), whose sum is σ = 2201271520. Its totient is φ = 613211040.

The previous prime is 1242145753. The next prime is 1242145757. The reversal of 1242145756 is 6575412421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242145753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1965105 + ... + 1965736.

Almost surely, 2^1242145756 is an apocalyptic number.

It is an amenable number.

1242145756 is a deficient number, since it is larger than the sum of its proper divisors (959125764).

1242145756 is a wasteful number, since it uses less digits than its factorization.

1242145756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930924 (or 3930922 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 1242145756 is about 35244.0882418598. The cubic root of 1242145756 is about 1074.9564088327.

The spelling of 1242145756 in words is "one billion, two hundred forty-two million, one hundred forty-five thousand, seven hundred fifty-six".