3636981 has 16 divisors (see below), whose sum is σ = 5457920. Its totient is φ = 2423196.

The previous prime is 3636973. The next prime is 3636991. The reversal of 3636981 is 1896363.

It is a happy number.

It is not a de Polignac number, because 3636981 - 2³ = 3636973 is a prime.

It is a super-2 number, since 2×3636981² = 26455261588722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

3636981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3636901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1356 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (341120).

Almost surely, 2^3636981 is an apocalyptic number.

It is an amenable number.

3636981 is a deficient number, since it is larger than the sum of its proper divisors (1820939).

3636981 is an frugal number, since it uses more digits than its factorization.

3636981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684 (or 1666 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 3636981 is about 1907.0870457323. The cubic root of 3636981 is about 153.7848939243.

The spelling of 3636981 in words is "three million, six hundred thirty-six thousand, nine hundred eighty-one".