1298728079 has 8 divisors (see below), whose sum is σ = 1427137488. Its totient is φ = 1172042560.

The previous prime is 1298728069. The next prime is 1298728103. The reversal of 1298728079 is 9708278921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1298728079 - 2¹² = 1298723983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1298728079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298728069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429392 + ... + 432405.

It is an arithmetic number, because the mean of its divisors is an integer number (178392186).

Almost surely, 2^1298728079 is an apocalyptic number.

1298728079 is a deficient number, since it is larger than the sum of its proper divisors (128409409).

1298728079 is a wasteful number, since it uses less digits than its factorization.

1298728079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861945.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 1298728079 is about 36037.8700674721. The cubic root of 1298728079 is about 1091.0368270352.

The spelling of 1298728079 in words is "one billion, two hundred ninety-eight million, seven hundred twenty-eight thousand, seventy-nine".