53851985 has 32 divisors (see below), whose sum is σ = 76809600. Its totient is φ = 35804160.

The previous prime is 53851981. The next prime is 53851997. The reversal of 53851985 is 58915835.

It is not a de Polignac number, because 53851985 - 2² = 53851981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53851981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29417 + ... + 31193.

It is an arithmetic number, because the mean of its divisors is an integer number (2400300).

Almost surely, 2^53851985 is an apocalyptic number.

53851985 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53851985 is a deficient number, since it is larger than the sum of its proper divisors (22957615).

53851985 is a wasteful number, since it uses less digits than its factorization.

53851985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841.

The product of its digits is 216000, while the sum is 44.

The square root of 53851985 is about 7338.3911724574. The cubic root of 53851985 is about 377.6306522602.

The spelling of 53851985 in words is "fifty-three million, eight hundred fifty-one thousand, nine hundred eighty-five".