1240728536 has 16 divisors (see below), whose sum is σ = 2380468200. Its totient is φ = 605937024.

The previous prime is 1240728521. The next prime is 1240728539. The reversal of 1240728536 is 6358270421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240728536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240728539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803041 + ... + 1803728.

Almost surely, 2^1240728536 is an apocalyptic number.

It is an amenable number.

1240728536 is a deficient number, since it is larger than the sum of its proper divisors (1139739664).

1240728536 is a wasteful number, since it uses less digits than its factorization.

1240728536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606818 (or 3606814 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1240728536 is about 35223.9767204102. The cubic root of 1240728536 is about 1074.5474312033.

Adding to 1240728536 its reverse (6358270421), we get a palindrome (7598998957).

The spelling of 1240728536 in words is "one billion, two hundred forty million, seven hundred twenty-eight thousand, five hundred thirty-six".