1798729879 has 4 divisors (see below), whose sum is σ = 1817273584. Its totient is φ = 1780186176.

The previous prime is 1798729859. The next prime is 1798729883. The reversal of 1798729879 is 9789278971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1798729879 - 2²³ = 1790341271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798729859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9271707 + ... + 9271900.

It is an arithmetic number, because the mean of its divisors is an integer number (454318396).

Almost surely, 2^1798729879 is an apocalyptic number.

1798729879 is a deficient number, since it is larger than the sum of its proper divisors (18543705).

1798729879 is an equidigital number, since it uses as much as digits as its factorization.

1798729879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543704.

The product of its digits is 32006016, while the sum is 67.

The square root of 1798729879 is about 42411.4357101950. The cubic root of 1798729879 is about 1216.1542157738.

The spelling of 1798729879 in words is "one billion, seven hundred ninety-eight million, seven hundred twenty-nine thousand, eight hundred seventy-nine".