1998755 has 8 divisors (see below), whose sum is σ = 2616624. Its totient is φ = 1453600.

The previous prime is 1998739. The next prime is 1998761. The reversal of 1998755 is 5578991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998755 - 2⁴ = 1998739 is a prime.

It is a Duffinian 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, 18116 + ... + 18225.

It is an arithmetic number, because the mean of its divisors is an integer number (327078).

2^1998755 is an apocalyptic number.

1998755 is a deficient number, since it is larger than the sum of its proper divisors (617869).

1998755 is a wasteful number, since it uses less digits than its factorization.

1998755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36357.

The product of its digits is 113400, while the sum is 44.

The square root of 1998755 is about 1413.7733198784. The cubic root of 1998755 is about 125.9659562011.

The spelling of 1998755 in words is "one million, nine hundred ninety-eight thousand, seven hundred fifty-five".