1298891520 has 216 divisors, whose sum is σ = 4532332896. Its totient is φ = 343425024.

The previous prime is 1298891501. The next prime is 1298891533. The reversal of 1298891520 is 251988921.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1577829 + ... + 1578651.

Almost surely, 2^1298891520 is an apocalyptic number.

1298891520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1298891520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2266166448).

1298891520 is an abundant number, since it is smaller than the sum of its proper divisors (3233441376).

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

1298891520 is a wasteful number, since it uses less digits than its factorization.

1298891520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987 (or 970 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1298891520 is about 36040.1376245985. The cubic root of 1298891520 is about 1091.0825930102.

The spelling of 1298891520 in words is "one billion, two hundred ninety-eight million, eight hundred ninety-one thousand, five hundred twenty".