1242155626 has 8 divisors (see below), whose sum is σ = 1972835460. Its totient is φ = 584543808.

The previous prime is 1242155623. The next prime is 1242155633. The reversal of 1242155626 is 6265512421.

It can be written as a sum of positive squares in 2 ways, for example, as 978125625 + 264030001 = 31275^2 + 16249^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 36533989 = 1242155626 / (1 + 2 + 4 + 2 + 1 + 5 + 5 + 6 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 1242155591 and 1242155600.

It is not an unprimeable number, because it can be changed into a prime (1242155623) 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 3 ways as a sum of consecutive naturals, for example, 18266961 + ... + 18267028.

Almost surely, 2^1242155626 is an apocalyptic number.

1242155626 is a deficient number, since it is larger than the sum of its proper divisors (730679834).

1242155626 is a wasteful number, since it uses less digits than its factorization.

1242155626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36534008.

The product of its digits is 28800, while the sum is 34.

The square root of 1242155626 is about 35244.2282650649. The cubic root of 1242155626 is about 1074.9592560004.

The spelling of 1242155626 in words is "one billion, two hundred forty-two million, one hundred fifty-five thousand, six hundred twenty-six".