1247615985 has 64 divisors (see below), whose sum is σ = 2493665280. Its totient is φ = 517466880.

The previous prime is 1247615959. The next prime is 1247616001. The reversal of 1247615985 is 5895167421.

It is a happy number.

It is not a de Polignac number, because 1247615985 - 2⁷ = 1247615857 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 956844 + ... + 958146.

It is an arithmetic number, because the mean of its divisors is an integer number (38963520).

Almost surely, 2^1247615985 is an apocalyptic number.

1247615985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247615985 is a deficient number, since it is larger than the sum of its proper divisors (1246049295).

1247615985 is a wasteful number, since it uses less digits than its factorization.

1247615985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158.

The product of its digits is 604800, while the sum is 48.

The square root of 1247615985 is about 35321.6079050770. The cubic root of 1247615985 is about 1076.5320819014.

The spelling of 1247615985 in words is "one billion, two hundred forty-seven million, six hundred fifteen thousand, nine hundred eighty-five".