1997279 has 6 divisors (see below), whose sum is σ = 2121984. Its totient is φ = 1879520.

The previous prime is 1997269. The next prime is 1997293. The reversal of 1997279 is 9727991.

It is a de Polignac number, because none of the positive numbers 2^k-1997279 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 (1997269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3167 + ... + 3744.

It is an arithmetic number, because the mean of its divisors is an integer number (353664).

2^1997279 is an apocalyptic number.

1997279 is a deficient number, since it is larger than the sum of its proper divisors (124705).

1997279 is an equidigital number, since it uses as much as digits as its factorization.

1997279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945 (or 6928 counting only the distinct ones).

The product of its digits is 71442, while the sum is 44.

The square root of 1997279 is about 1413.2512161679. The cubic root of 1997279 is about 125.9349416385.

The spelling of 1997279 in words is "one million, nine hundred ninety-seven thousand, two hundred seventy-nine".