1985428 has 24 divisors (see below), whose sum is σ = 3610880. Its totient is φ = 954720.

The previous prime is 1985419. The next prime is 1985441. The reversal of 1985428 is 8245891.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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, 19225 + ... + 19327.

2^1985428 is an apocalyptic number.

It is an amenable number.

1985428 is a deficient number, since it is larger than the sum of its proper divisors (1625452).

1985428 is a wasteful number, since it uses less digits than its factorization.

1985428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 245 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 1985428 is about 1409.0521636902. The cubic root of 1985428 is about 125.6853659864.

The spelling of 1985428 in words is "one million, nine hundred eighty-five thousand, four hundred twenty-eight".