1985553 has 12 divisors (see below), whose sum is σ = 2974608. Its totient is φ = 1323540.

The previous prime is 1985551. The next prime is 1985561. The reversal of 1985553 is 3555891.

It is a happy number.

It is not a de Polignac number, because 1985553 - 2¹ = 1985551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3843 + ... + 4328.

It is an arithmetic number, because the mean of its divisors is an integer number (247884).

2^1985553 is an apocalyptic number.

It is an amenable number.

1985553 is a deficient number, since it is larger than the sum of its proper divisors (989055).

1985553 is an frugal number, since it uses more digits than its factorization.

1985553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186 (or 8174 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 1985553 is about 1409.0965190504. The cubic root of 1985553 is about 125.6880035942.

The spelling of 1985553 in words is "one million, nine hundred eighty-five thousand, five hundred fifty-three".