2198729 has 8 divisors (see below), whose sum is σ = 2507400. Its totient is φ = 1910016.

The previous prime is 2198723. The next prime is 2198747. The reversal of 2198729 is 9278912.

It can be written as a sum of positive squares in 4 ways, for example, as 182329 + 2016400 = 427^2 + 1420^2 .

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 2198729 - 2⁸ = 2198473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2198692 and 2198701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198723) 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, 4754 + ... + 5195.

It is an arithmetic number, because the mean of its divisors is an integer number (313425).

2^2198729 is an apocalyptic number.

It is an amenable number.

2198729 is a deficient number, since it is larger than the sum of its proper divisors (308671).

2198729 is a wasteful number, since it uses less digits than its factorization.

2198729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9979.

The product of its digits is 18144, while the sum is 38.

The square root of 2198729 is about 1482.8111815063. The cubic root of 2198729 is about 130.0340936220.

The spelling of 2198729 in words is "two million, one hundred ninety-eight thousand, seven hundred twenty-nine".