1243532042 has 4 divisors (see below), whose sum is σ = 1865298066. Its totient is φ = 621766020.

The previous prime is 1243532039. The next prime is 1243532077. The reversal of 1243532042 is 2402353421.

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., 647244481 + 596287561 = 25441^2 + 24419^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310883009 + ... + 310883012.

Almost surely, 2^1243532042 is an apocalyptic number.

1243532042 is a deficient number, since it is larger than the sum of its proper divisors (621766024).

1243532042 is an equidigital number, since it uses as much as digits as its factorization.

1243532042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621766023.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1243532042 is about 35263.7496871788. The cubic root of 1243532042 is about 1075.3561587501.

Adding to 1243532042 its reverse (2402353421), we get a palindrome (3645885463).

The spelling of 1243532042 in words is "one billion, two hundred forty-three million, five hundred thirty-two thousand, forty-two".