1997879 has 8 divisors (see below), whose sum is σ = 2162832. Its totient is φ = 1834560.

The previous prime is 1997867. The next prime is 1997887. The reversal of 1997879 is 9787991.

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

It is not a de Polignac number, because 1997879 - 2²⁰ = 949303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997899) 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, 3824 + ... + 4314.

It is an arithmetic number, because the mean of its divisors is an integer number (270354).

2^1997879 is an apocalyptic number.

1997879 is a deficient number, since it is larger than the sum of its proper divisors (164953).

1997879 is a wasteful number, since it uses less digits than its factorization.

1997879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817.

The product of its digits is 285768, while the sum is 50.

The square root of 1997879 is about 1413.4634767124. The cubic root of 1997879 is about 125.9475510268.

The spelling of 1997879 in words is "one million, nine hundred ninety-seven thousand, eight hundred seventy-nine".