1985977 has 8 divisors (see below), whose sum is σ = 2307392. Its totient is φ = 1674000.

The previous prime is 1985939. The next prime is 1985987. The reversal of 1985977 is 7795891.

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

It is a cyclic number.

It is not a de Polignac number, because 1985977 - 2⁷ = 1985849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985987) 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 7 ways as a sum of consecutive naturals, for example, 1899 + ... + 2752.

It is an arithmetic number, because the mean of its divisors is an integer number (288424).

2^1985977 is an apocalyptic number.

It is an amenable number.

1985977 is a deficient number, since it is larger than the sum of its proper divisors (321415).

1985977 is an equidigital number, since it uses as much as digits as its factorization.

1985977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4719.

The product of its digits is 158760, while the sum is 46.

The square root of 1985977 is about 1409.2469620333. The cubic root of 1985977 is about 125.6969495353.

The spelling of 1985977 in words is "one million, nine hundred eighty-five thousand, nine hundred seventy-seven".