1798729861 has 4 divisors (see below), whose sum is σ = 1840560832. Its totient is φ = 1756898892.

The previous prime is 1798729859. The next prime is 1798729883. The reversal of 1798729861 is 1689278971.

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.

It is a cyclic number.

It is not a de Polignac number, because 1798729861 - 2¹ = 1798729859 is a prime.

It is a super-2 number, since 2×1798729861² = 6470858225706158642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1798729796 and 1798729805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798729841) 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, 20915421 + ... + 20915506.

It is an arithmetic number, because the mean of its divisors is an integer number (460140208).

Almost surely, 2^1798729861 is an apocalyptic number.

It is an amenable number.

1798729861 is a deficient number, since it is larger than the sum of its proper divisors (41830971).

1798729861 is an equidigital number, since it uses as much as digits as its factorization.

1798729861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41830970.

The product of its digits is 3048192, while the sum is 58.

The square root of 1798729861 is about 42411.4354979880. The cubic root of 1798729861 is about 1216.1542117171.

The spelling of 1798729861 in words is "one billion, seven hundred ninety-eight million, seven hundred twenty-nine thousand, eight hundred sixty-one".