1247428239 has 16 divisors (see below), whose sum is σ = 1705433184. Its totient is φ = 810560000.

The previous prime is 1247428219. The next prime is 1247428279. The reversal of 1247428239 is 9328247421.

It is a cyclic number.

It is not a de Polignac number, because 1247428239 - 2⁷ = 1247428111 is a prime.

It is a super-2 number, since 2×1247428239² = 3112154422909282242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1247428239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247428219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142489 + ... + 150989.

It is an arithmetic number, because the mean of its divisors is an integer number (106589574).

Almost surely, 2^1247428239 is an apocalyptic number.

1247428239 is a deficient number, since it is larger than the sum of its proper divisors (458004945).

1247428239 is a wasteful number, since it uses less digits than its factorization.

1247428239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9738.

The product of its digits is 193536, while the sum is 42.

The square root of 1247428239 is about 35318.9501401160. The cubic root of 1247428239 is about 1076.4780789780.

The spelling of 1247428239 in words is "one billion, two hundred forty-seven million, four hundred twenty-eight thousand, two hundred thirty-nine".