1242097815 has 24 divisors (see below), whose sum is σ = 2311824240. Its totient is φ = 567815808.

The previous prime is 1242097793. The next prime is 1242097817. The reversal of 1242097815 is 5187902421.

It is not a de Polignac number, because 1242097815 - 2⁶ = 1242097751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242097817) 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 23 ways as a sum of consecutive naturals, for example, 844230 + ... + 845699.

It is an arithmetic number, because the mean of its divisors is an integer number (96326010).

Almost surely, 2^1242097815 is an apocalyptic number.

1242097815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242097815 is a deficient number, since it is larger than the sum of its proper divisors (1069726425).

1242097815 is a wasteful number, since it uses less digits than its factorization.

1242097815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689951 (or 1689944 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 1242097815 is about 35243.4081070489. The cubic root of 1242097815 is about 1074.9425792297.

The spelling of 1242097815 in words is "one billion, two hundred forty-two million, ninety-seven thousand, eight hundred fifteen".