1247487889 has 8 divisors (see below), whose sum is σ = 1251178272. Its totient is φ = 1243804320.

The previous prime is 1247487877. The next prime is 1247487907. The reversal of 1247487889 is 9887847421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1247487889 - 2²¹ = 1245390737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247487589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814054 + ... + 815584.

It is an arithmetic number, because the mean of its divisors is an integer number (156397284).

Almost surely, 2^1247487889 is an apocalyptic number.

It is an amenable number.

1247487889 is a deficient number, since it is larger than the sum of its proper divisors (3690383).

1247487889 is a wasteful number, since it uses less digits than its factorization.

1247487889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its digits is 7225344, while the sum is 58.

The square root of 1247487889 is about 35319.7945775453. The cubic root of 1247487889 is about 1076.4952371845.

The spelling of 1247487889 in words is "one billion, two hundred forty-seven million, four hundred eighty-seven thousand, eight hundred eighty-nine".