1243641542 has 64 divisors (see below), whose sum is σ = 2336947200. Its totient is φ = 487918080.

The previous prime is 1243641541. The next prime is 1243641551. The reversal of 1243641542 is 2451463421.

It is a junction number, because it is equal to n+sod(n) for n = 1243641499 and 1243641508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243641541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427838 + ... + 430734.

It is an arithmetic number, because the mean of its divisors is an integer number (36514800).

Almost surely, 2^1243641542 is an apocalyptic number.

1243641542 is a deficient number, since it is larger than the sum of its proper divisors (1093305658).

1243641542 is a wasteful number, since it uses less digits than its factorization.

1243641542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021.

The product of its digits is 23040, while the sum is 32.

The square root of 1243641542 is about 35265.3022388863. The cubic root of 1243641542 is about 1075.3877215458.

The spelling of 1243641542 in words is "one billion, two hundred forty-three million, six hundred forty-one thousand, five hundred forty-two".