1240728537 has 16 divisors (see below), whose sum is σ = 1732819968. Its totient is φ = 788169360.

The previous prime is 1240728521. The next prime is 1240728539. The reversal of 1240728537 is 7358270421.

It is not a de Polignac number, because 1240728537 - 2⁴ = 1240728521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240728495 and 1240728504.

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 15 ways as a sum of consecutive naturals, for example, 16039 + ... + 52332.

It is an arithmetic number, because the mean of its divisors is an integer number (108301248).

Almost surely, 2^1240728537 is an apocalyptic number.

It is an amenable number.

1240728537 is a deficient number, since it is larger than the sum of its proper divisors (492091431).

1240728537 is a wasteful number, since it uses less digits than its factorization.

1240728537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68660.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 1240728537 is about 35223.9767346051. The cubic root of 1240728537 is about 1074.5474314920.

Adding to 1240728537 its reverse (7358270421), we get a palindrome (8598998958).

The spelling of 1240728537 in words is "one billion, two hundred forty million, seven hundred twenty-eight thousand, five hundred thirty-seven".