1294981728 has 24 divisors (see below), whose sum is σ = 3399327288. Its totient is φ = 431660544.

The previous prime is 1294981711. The next prime is 1294981733. The reversal of 1294981728 is 8271894921.

It is a happy number.

1294981728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6744601 + ... + 6744792.

It is an arithmetic number, because the mean of its divisors is an integer number (141638637).

Almost surely, 2^1294981728 is an apocalyptic number.

It is an amenable number.

1294981728 is an abundant number, since it is smaller than the sum of its proper divisors (2104345560).

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

1294981728 is a wasteful number, since it uses less digits than its factorization.

1294981728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13489406 (or 13489398 counting only the distinct ones).

The product of its digits is 580608, while the sum is 51.

The square root of 1294981728 is about 35985.8545542551. The cubic root of 1294981728 is about 1089.9867372064.

The spelling of 1294981728 in words is "one billion, two hundred ninety-four million, nine hundred eighty-one thousand, seven hundred twenty-eight".