1997278 has 8 divisors (see below), whose sum is σ = 3034080. Its totient is φ = 985920.

The previous prime is 1997269. The next prime is 1997293. The reversal of 1997278 is 8727991.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6163 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (379260).

2^1997278 is an apocalyptic number.

1997278 is a deficient number, since it is larger than the sum of its proper divisors (1036802).

1997278 is a wasteful number, since it uses less digits than its factorization.

1997278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12722.

The product of its digits is 63504, while the sum is 43.

The square root of 1997278 is about 1413.2508623737. The cubic root of 1997278 is about 125.9349206207.

The spelling of 1997278 in words is "one million, nine hundred ninety-seven thousand, two hundred seventy-eight".