3817681 has 16 divisors (see below), whose sum is σ = 4584448. Its totient is φ = 3110400.

The previous prime is 3817679. The next prime is 3817687. The reversal of 3817681 is 1867183.

It is a 5-Lehmer number, since φ(3817681) divides (3817681-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 3817681 - 2¹ = 3817679 is a prime.

It is a super-2 number, since 2×3817681² = 29149376435522, which contains 22 as substring.

It is a deceptive number, since it divides R_3817680.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3817687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15721 + ... + 15961.

It is an arithmetic number, because the mean of its divisors is an integer number (286528).

Almost surely, 2^3817681 is an apocalyptic number.

3817681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3817681 is a deficient number, since it is larger than the sum of its proper divisors (766767).

3817681 is a wasteful number, since it uses less digits than its factorization.

3817681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its digits is 8064, while the sum is 34.

The square root of 3817681 is about 1953.8886866964. Note that the first 3 decimals coincide. The cubic root of 3817681 is about 156.2907273033.

The spelling of 3817681 in words is "three million, eight hundred seventeen thousand, six hundred eighty-one".