128799893 has 4 divisors (see below), whose sum is σ = 130614048. Its totient is φ = 126985740.

The previous prime is 128799889. The next prime is 128799907. The reversal of 128799893 is 398997821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 398997821 = 233 ⋅1712437.

It is a cyclic number.

It is not a de Polignac number, because 128799893 - 2² = 128799889 is a prime.

It is a super-2 number, since 2×128799893² = 33178824873622898, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128799863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906971 + ... + 907112.

It is an arithmetic number, because the mean of its divisors is an integer number (32653512).

Almost surely, 2^128799893 is an apocalyptic number.

It is an amenable number.

128799893 is a deficient number, since it is larger than the sum of its proper divisors (1814155).

128799893 is an equidigital number, since it uses as much as digits as its factorization.

128799893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814154.

The product of its digits is 1959552, while the sum is 56.

The square root of 128799893 is about 11349.0040532198. The cubic root of 128799893 is about 505.0160345201.

The spelling of 128799893 in words is "one hundred twenty-eight million, seven hundred ninety-nine thousand, eight hundred ninety-three".