1242626618 has 4 divisors (see below), whose sum is σ = 1863939930. Its totient is φ = 621313308.

The previous prime is 1242626617. The next prime is 1242626621. The reversal of 1242626618 is 8166262421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 718079209 + 524547409 = 26797^2 + 22903^2 .

It is not an unprimeable number, because it can be changed into a prime (1242626617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310656653 + ... + 310656656.

Almost surely, 2^1242626618 is an apocalyptic number.

1242626618 is a deficient number, since it is larger than the sum of its proper divisors (621313312).

1242626618 is an equidigital number, since it uses as much as digits as its factorization.

1242626618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621313311.

The product of its digits is 55296, while the sum is 38.

The square root of 1242626618 is about 35250.9094634451. The cubic root of 1242626618 is about 1075.0951040432.

The spelling of 1242626618 in words is "one billion, two hundred forty-two million, six hundred twenty-six thousand, six hundred eighteen".