1243726536 has 32 divisors (see below), whose sum is σ = 3348495360. Its totient is φ = 382684992.

The previous prime is 1243726507. The next prime is 1243726553. The reversal of 1243726536 is 6356273421.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1243726494 and 1243726503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1992840 + ... + 1993463.

It is an arithmetic number, because the mean of its divisors is an integer number (104640480).

Almost surely, 2^1243726536 is an apocalyptic number.

It is an amenable number.

1243726536 is an abundant number, since it is smaller than the sum of its proper divisors (2104768824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243726536 is a wasteful number, since it uses less digits than its factorization.

1243726536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986325 (or 3986321 counting only the distinct ones).

The product of its digits is 181440, while the sum is 39.

The square root of 1243726536 is about 35266.5072838238. The cubic root of 1243726536 is about 1075.4122193395.

Adding to 1243726536 its reverse (6356273421), we get a palindrome (7599999957).

The spelling of 1243726536 in words is "one billion, two hundred forty-three million, seven hundred twenty-six thousand, five hundred thirty-six".