3658991 has 8 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 3127608.

The previous prime is 3658981. The next prime is 3659009. The reversal of 3658991 is 1998563.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3658991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3658981) 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, 4670 + ... + 5396.

It is an arithmetic number, because the mean of its divisors is an integer number (524160).

Almost surely, 2^3658991 is an apocalyptic number.

3658991 is a deficient number, since it is larger than the sum of its proper divisors (534289).

3658991 is an equidigital number, since it uses as much as digits as its factorization.

3658991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its digits is 58320, while the sum is 41.

The square root of 3658991 is about 1912.8489224191. The cubic root of 3658991 is about 154.0944914001.

The spelling of 3658991 in words is "three million, six hundred fifty-eight thousand, nine hundred ninety-one".