1298987928 has 160 divisors (see below), whose sum is σ = 4339272960. Its totient is φ = 354974400.

The previous prime is 1298987909. The next prime is 1298987929. The reversal of 1298987928 is 8297898921.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298987929) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 98103 + ... + 110553.

It is an arithmetic number, because the mean of its divisors is an integer number (27120456).

Almost surely, 2^1298987928 is an apocalyptic number.

1298987928 is a gapful number since it is divisible by the number (18) 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 1298987928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2169636480).

1298987928 is an abundant number, since it is smaller than the sum of its proper divisors (3040285032).

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

1298987928 is a wasteful number, since it uses less digits than its factorization.

1298987928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12499 (or 12486 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 1298987928 is about 36041.4751085468. The cubic root of 1298987928 is about 1091.1095869217.

The spelling of 1298987928 in words is "one billion, two hundred ninety-eight million, nine hundred eighty-seven thousand, nine hundred twenty-eight".