3609981 has 32 divisors (see below), whose sum is σ = 5836800. Its totient is φ = 2196720.

The previous prime is 3609973. The next prime is 3609997. The reversal of 3609981 is 1899063.

It is not a de Polignac number, because 3609981 - 2³ = 3609973 is a prime.

It is a super-2 number, since 2×3609981² = 26063925640722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3609911) 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, 15790 + ... + 16016.

It is an arithmetic number, because the mean of its divisors is an integer number (182400).

Almost surely, 2^3609981 is an apocalyptic number.

3609981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3609981 is a deficient number, since it is larger than the sum of its proper divisors (2226819).

3609981 is a wasteful number, since it uses less digits than its factorization.

3609981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 3609981 is about 1899.9949999934. The cubic root of 3609981 is about 153.4033953082.

The spelling of 3609981 in words is "three million, six hundred nine thousand, nine hundred eighty-one".