3917813 has 8 divisors (see below), whose sum is σ = 4131000. Its totient is φ = 3709888.

The previous prime is 3917801. The next prime is 3917827. The reversal of 3917813 is 3187193.

It can be written as a sum of positive squares in 4 ways, for example, as 1909924 + 2007889 = 1382^2 + 1417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3917813 - 2¹² = 3913717 is a prime.

It is an Ulam number.

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 3917813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3917833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (516375).

Almost surely, 2^3917813 is an apocalyptic number.

It is an amenable number.

3917813 is a deficient number, since it is larger than the sum of its proper divisors (213187).

3917813 is a wasteful number, since it uses less digits than its factorization.

3917813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631.

The product of its digits is 4536, while the sum is 32.

The square root of 3917813 is about 1979.3466093638. The cubic root of 3917813 is about 157.6453751393.

The spelling of 3917813 in words is "three million, nine hundred seventeen thousand, eight hundred thirteen".