1228979872 has 48 divisors (see below), whose sum is σ = 2516113152. Its totient is φ = 590261760.

The previous prime is 1228979867. The next prime is 1228979897. The reversal of 1228979872 is 2789798221.

It is a super-2 number, since 2×1228979872² = 3020783051562272768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131383 + ... + 140425.

It is an arithmetic number, because the mean of its divisors is an integer number (52419024).

Almost surely, 2^1228979872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228979872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258056576).

1228979872 is an abundant number, since it is smaller than the sum of its proper divisors (1287133280).

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

1228979872 is a wasteful number, since it uses less digits than its factorization.

1228979872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221 (or 9213 counting only the distinct ones).

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

The square root of 1228979872 is about 35056.8092101948. The cubic root of 1228979872 is about 1071.1449798401.

The spelling of 1228979872 in words is "one billion, two hundred twenty-eight million, nine hundred seventy-nine thousand, eight hundred seventy-two".