1242236864 has 28 divisors (see below), whose sum is σ = 2689162008. Its totient is φ = 564652800.

The previous prime is 1242236861. The next prime is 1242236873. The reversal of 1242236864 is 4686322421.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242236861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881567 + ... + 882974.

Almost surely, 2^1242236864 is an apocalyptic number.

It is an amenable number.

1242236864 is an abundant number, since it is smaller than the sum of its proper divisors (1446925144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242236864 is a wasteful number, since it uses less digits than its factorization.

1242236864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764564 (or 1764554 counting only the distinct ones).

The product of its digits is 110592, while the sum is 38.

The square root of 1242236864 is about 35245.3807469858. The cubic root of 1242236864 is about 1074.9826898961.

The spelling of 1242236864 in words is "one billion, two hundred forty-two million, two hundred thirty-six thousand, eight hundred sixty-four".