1247079889 has 8 divisors (see below), whose sum is σ = 1360766880. Its totient is φ = 1133445600.

The previous prime is 1247079871. The next prime is 1247079917. The reversal of 1247079889 is 9889707421.

It is a happy number.

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 1247079889 - 2¹³ = 1247071697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1247079289) 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, 49149 + ... + 70069.

It is an arithmetic number, because the mean of its divisors is an integer number (170095860).

Almost surely, 2^1247079889 is an apocalyptic number.

It is an amenable number.

1247079889 is a deficient number, since it is larger than the sum of its proper divisors (113686991).

1247079889 is a wasteful number, since it uses less digits than its factorization.

1247079889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26351.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The square root of 1247079889 is about 35314.0183071822. The cubic root of 1247079889 is about 1076.3778658519.

The spelling of 1247079889 in words is "one billion, two hundred forty-seven million, seventy-nine thousand, eight hundred eighty-nine".