3919681 has 4 divisors (see below), whose sum is σ = 4126000. Its totient is φ = 3713364.

The previous prime is 3919679. The next prime is 3919687. The reversal of 3919681 is 1869193.

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.

It is a cyclic number.

It is not a de Polignac number, because 3919681 - 2¹ = 3919679 is a prime.

It is a super-2 number, since 2×3919681² = 30727798283522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3919681.

It is not an unprimeable number, because it can be changed into a prime (3919687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103131 + ... + 103168.

It is an arithmetic number, because the mean of its divisors is an integer number (1031500).

Almost surely, 2^3919681 is an apocalyptic number.

It is an amenable number.

3919681 is a deficient number, since it is larger than the sum of its proper divisors (206319).

3919681 is a wasteful number, since it uses less digits than its factorization.

3919681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206318.

The product of its digits is 11664, while the sum is 37.

The square root of 3919681 is about 1979.8184260179. The cubic root of 3919681 is about 157.6704260857.

The spelling of 3919681 in words is "three million, nine hundred nineteen thousand, six hundred eighty-one".