1259722128 has 160 divisors (see below), whose sum is σ = 3859467264. Its totient is φ = 346553856.

The previous prime is 1259722127. The next prime is 1259722129. The reversal of 1259722128 is 8212279521.

It is an interprime number because it is at equal distance from previous prime (1259722127) and next prime (1259722129).

It is not an unprimeable number, because it can be changed into a prime (1259722127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1329751 + ... + 1330697.

Almost surely, 2^1259722128 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 1259722128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1929733632).

1259722128 is an abundant number, since it is smaller than the sum of its proper divisors (2599745136).

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

1259722128 is a wasteful number, since it uses less digits than its factorization.

1259722128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 1259722128 is about 35492.5644043932. The cubic root of 1259722128 is about 1080.0028943681.

The spelling of 1259722128 in words is "one billion, two hundred fifty-nine million, seven hundred twenty-two thousand, one hundred twenty-eight".