1998677 has 8 divisors (see below), whose sum is σ = 2118336. Its totient is φ = 1881792.

The previous prime is 1998643. The next prime is 1998679. The reversal of 1998677 is 7768991.

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 1998677 - 2¹⁴ = 1982293 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998679) 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, 893 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (264792).

2^1998677 is an apocalyptic number.

It is an amenable number.

1998677 is a deficient number, since it is larger than the sum of its proper divisors (119659).

1998677 is a wasteful number, since it uses less digits than its factorization.

1998677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387.

The product of its digits is 190512, while the sum is 47.

The square root of 1998677 is about 1413.7457338574. The cubic root of 1998677 is about 125.9643176023.

The spelling of 1998677 in words is "one million, nine hundred ninety-eight thousand, six hundred seventy-seven".