1978585 has 8 divisors (see below), whose sum is σ = 2713536. Its totient is φ = 1356720.

The previous prime is 1978567. The next prime is 1978589. The reversal of 1978585 is 5858791.

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

It is not a de Polignac number, because 1978585 - 2¹¹ = 1976537 is a prime.

1978585 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1978589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28231 + ... + 28300.

It is an arithmetic number, because the mean of its divisors is an integer number (339192).

2^1978585 is an apocalyptic number.

It is an amenable number.

1978585 is a deficient number, since it is larger than the sum of its proper divisors (734951).

1978585 is an equidigital number, since it uses as much as digits as its factorization.

1978585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56543.

The product of its digits is 100800, while the sum is 43.

The square root of 1978585 is about 1406.6218397281. The cubic root of 1978585 is about 125.5408035446.

The spelling of 1978585 in words is "one million, nine hundred seventy-eight thousand, five hundred eighty-five".