1985149 has 4 divisors (see below), whose sum is σ = 1988320. Its totient is φ = 1981980.

The previous prime is 1985077. The next prime is 1985167. The reversal of 1985149 is 9415891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9415891 = 193 ⋅48787.

It is a cyclic number.

It is not a de Polignac number, because 1985149 - 2¹⁵ = 1952381 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 (1985189) 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, 297 + ... + 2014.

It is an arithmetic number, because the mean of its divisors is an integer number (497080).

2^1985149 is an apocalyptic number.

It is an amenable number.

1985149 is a deficient number, since it is larger than the sum of its proper divisors (3171).

1985149 is an equidigital number, since it uses as much as digits as its factorization.

1985149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3170.

The product of its digits is 12960, while the sum is 37.

The square root of 1985149 is about 1408.9531574896. The cubic root of 1985149 is about 125.6794784465.

It can be divided in two parts, 19851 and 49, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1985149 in words is "one million, nine hundred eighty-five thousand, one hundred forty-nine".