3721985 has 4 divisors (see below), whose sum is σ = 4466388. Its totient is φ = 2977584.

The previous prime is 3721981. The next prime is 3722009. The reversal of 3721985 is 5891273.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2093809 + 1628176 = 1447^2 + 1276^2 .

It is a cyclic number.

It is not a de Polignac number, because 3721985 - 2² = 3721981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372194 + ... + 372203.

It is an arithmetic number, because the mean of its divisors is an integer number (1116597).

Almost surely, 2^3721985 is an apocalyptic number.

It is an amenable number.

3721985 is a deficient number, since it is larger than the sum of its proper divisors (744403).

3721985 is an equidigital number, since it uses as much as digits as its factorization.

3721985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744402.

The product of its digits is 15120, while the sum is 35.

The square root of 3721985 is about 1929.2446708492. The cubic root of 3721985 is about 154.9737728777.

It can be divided in two parts, 37 and 21985, that added together give a palindrome (22022).

The spelling of 3721985 in words is "three million, seven hundred twenty-one thousand, nine hundred eighty-five".