3915661 has 8 divisors (see below), whose sum is σ = 4165560. Its totient is φ = 3680704.

The previous prime is 3915631. The next prime is 3915683. The reversal of 3915661 is 1665193.

It can be written as a sum of positive squares in 4 ways, for example, as 697225 + 3218436 = 835^2 + 1794^2 .

It is not a de Polignac number, because 3915661 - 2⁵ = 3915629 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3915601) 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, 4515 + ... + 5311.

It is an arithmetic number, because the mean of its divisors is an integer number (520695).

Almost surely, 2^3915661 is an apocalyptic number.

It is an amenable number.

3915661 is a deficient number, since it is larger than the sum of its proper divisors (249899).

3915661 is an frugal number, since it uses more digits than its factorization.

3915661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 814 counting only the distinct ones).

The product of its digits is 4860, while the sum is 31.

The square root of 3915661 is about 1978.8029209600. The cubic root of 3915661 is about 157.6165057180.

The spelling of 3915661 in words is "three million, nine hundred fifteen thousand, six hundred sixty-one".