1998265 has 8 divisors (see below), whose sum is σ = 2539080. Its totient is φ = 1504512.

The previous prime is 1998257. The next prime is 1998277. The reversal of 1998265 is 5628991.

It can be written as a sum of positive squares in 4 ways, for example, as 1022121 + 976144 = 1011^2 + 988^2 .

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 1998265 - 2³ = 1998257 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11670 + ... + 11839.

It is an arithmetic number, because the mean of its divisors is an integer number (317385).

2^1998265 is an apocalyptic number.

It is an amenable number.

1998265 is a deficient number, since it is larger than the sum of its proper divisors (540815).

1998265 is a wasteful number, since it uses less digits than its factorization.

1998265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23531.

The product of its digits is 38880, while the sum is 40.

The square root of 1998265 is about 1413.6000141483. The cubic root of 1998265 is about 125.9556617323.

It can be divided in two parts, 199 and 8265, that added together give a square (8464 = 92²).

The spelling of 1998265 in words is "one million, nine hundred ninety-eight thousand, two hundred sixty-five".