1242543634 has 16 divisors (see below), whose sum is σ = 1975228416. Its totient is φ = 584200000.

The previous prime is 1242543629. The next prime is 1242543637. The reversal of 1242543634 is 4363452421.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 1242543634.

It is not an unprimeable number, because it can be changed into a prime (1242543637) 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, 23259 + ... + 55009.

It is an arithmetic number, because the mean of its divisors is an integer number (123451776).

Almost surely, 2^1242543634 is an apocalyptic number.

1242543634 is a deficient number, since it is larger than the sum of its proper divisors (732684782).

1242543634 is a wasteful number, since it uses less digits than its factorization.

1242543634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32921.

The product of its digits is 69120, while the sum is 34.

The square root of 1242543634 is about 35249.7323961474. The cubic root of 1242543634 is about 1075.0711714913.

The spelling of 1242543634 in words is "one billion, two hundred forty-two million, five hundred forty-three thousand, six hundred thirty-four".