3635981 has 8 divisors (see below), whose sum is σ = 3737664. Its totient is φ = 3535840.

The previous prime is 3635971. The next prime is 3635987. The reversal of 3635981 is 1895363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3635981 - 2¹⁴ = 3619597 is a prime.

It is a super-2 number, since 2×3635981² = 26440715664722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3635987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5585 + ... + 6201.

It is an arithmetic number, because the mean of its divisors is an integer number (467208).

Almost surely, 2^3635981 is an apocalyptic number.

It is an amenable number.

3635981 is a deficient number, since it is larger than the sum of its proper divisors (101683).

3635981 is an equidigital number, since it uses as much as digits as its factorization.

3635981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771.

The product of its digits is 19440, while the sum is 35.

The square root of 3635981 is about 1906.8248477508. The cubic root of 3635981 is about 153.7707980766.

The spelling of 3635981 in words is "three million, six hundred thirty-five thousand, nine hundred eighty-one".