1242649658 has 16 divisors (see below), whose sum is σ = 1956272256. Its totient is φ = 590871600.

The previous prime is 1242649657. The next prime is 1242649687. The reversal of 1242649658 is 8569462421.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242649657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70118 + ... + 86033.

It is an arithmetic number, because the mean of its divisors is an integer number (122267016).

Almost surely, 2^1242649658 is an apocalyptic number.

1242649658 is a deficient number, since it is larger than the sum of its proper divisors (713622598).

1242649658 is a wasteful number, since it uses less digits than its factorization.

1242649658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156349.

The product of its digits is 829440, while the sum is 47.

The square root of 1242649658 is about 35251.2362620093. The cubic root of 1242649658 is about 1075.1017485809.

The spelling of 1242649658 in words is "one billion, two hundred forty-two million, six hundred forty-nine thousand, six hundred fifty-eight".