3689981 has 4 divisors (see below), whose sum is σ = 3706752. Its totient is φ = 3673212.

The previous prime is 3689963. The next prime is 3689993. The reversal of 3689981 is 1899863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1899863 = 7 ⋅271409.

It is a cyclic number.

It is not a de Polignac number, because 3689981 - 2¹⁴ = 3673597 is a prime.

It is a super-2 number, since 2×3689981² = 27231919560722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3689911) 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, 8051 + ... + 8496.

It is an arithmetic number, because the mean of its divisors is an integer number (926688).

Almost surely, 2^3689981 is an apocalyptic number.

It is an amenable number.

3689981 is a deficient number, since it is larger than the sum of its proper divisors (16771).

3689981 is a wasteful number, since it uses less digits than its factorization.

3689981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16770.

The product of its digits is 93312, while the sum is 44.

The square root of 3689981 is about 1920.9323257210. The cubic root of 3689981 is about 154.5283058565.

The spelling of 3689981 in words is "three million, six hundred eighty-nine thousand, nine hundred eighty-one".