1242737643 has 16 divisors (see below), whose sum is σ = 1894196480. Its totient is φ = 709947936.

The previous prime is 1242737627. The next prime is 1242737677. The reversal of 1242737643 is 3467372421.

It is a happy number.

It is not a de Polignac number, because 1242737643 - 2⁴ = 1242737627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242737603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129321 + ... + 138597.

It is an arithmetic number, because the mean of its divisors is an integer number (118387280).

Almost surely, 2^1242737643 is an apocalyptic number.

1242737643 is a deficient number, since it is larger than the sum of its proper divisors (651458837).

1242737643 is an equidigital number, since it uses as much as digits as its factorization.

1242737643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15666.

The product of its digits is 169344, while the sum is 39.

The square root of 1242737643 is about 35252.4842103362. The cubic root of 1242737643 is about 1075.1271219418.

The spelling of 1242737643 in words is "one billion, two hundred forty-two million, seven hundred thirty-seven thousand, six hundred forty-three".