1247989104 has 30 divisors (see below), whose sum is σ = 3492636576. Its totient is φ = 415996320.

The previous prime is 1247989051. The next prime is 1247989109. The reversal of 1247989104 is 4019897421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1247989104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247989109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4333152 + ... + 4333439.

Almost surely, 2^1247989104 is an apocalyptic number.

It is an amenable number.

1247989104 is an abundant number, since it is smaller than the sum of its proper divisors (2244647472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247989104 is a wasteful number, since it uses less digits than its factorization.

1247989104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666605 (or 8666596 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1247989104 is about 35326.8892488427. The cubic root of 1247989104 is about 1076.6393891025.

The spelling of 1247989104 in words is "one billion, two hundred forty-seven million, nine hundred eighty-nine thousand, one hundred four".