1979287 has 4 divisors (see below), whose sum is σ = 2083480. Its totient is φ = 1875096.

The previous prime is 1979281. The next prime is 1979291. The reversal of 1979287 is 7829791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1979287 is a prime.

It is a Duffinian number.

1979287 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52068 + ... + 52105.

It is an arithmetic number, because the mean of its divisors is an integer number (520870).

2^1979287 is an apocalyptic number.

1979287 is a deficient number, since it is larger than the sum of its proper divisors (104193).

1979287 is a wasteful number, since it uses less digits than its factorization.

1979287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104192.

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

The square root of 1979287 is about 1406.8713516168. The cubic root of 1979287 is about 125.5556490400. Note that the first 3 decimals are identical.

The spelling of 1979287 in words is "one million, nine hundred seventy-nine thousand, two hundred eighty-seven".