3658261 has 4 divisors (see below), whose sum is σ = 3663072. Its totient is φ = 3653452.

The previous prime is 3658211. The next prime is 3658283. The reversal of 3658261 is 1628563.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1628563 = 379 ⋅4297.

It is a cyclic number.

It is not a de Polignac number, because 3658261 - 2⁹ = 3657749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3658201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (915768).

Almost surely, 2^3658261 is an apocalyptic number.

It is an amenable number.

3658261 is a deficient number, since it is larger than the sum of its proper divisors (4811).

3658261 is an equidigital number, since it uses as much as digits as its factorization.

3658261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810.

The product of its digits is 8640, while the sum is 31.

The square root of 3658261 is about 1912.6580980405. The cubic root of 3658261 is about 154.0842429955.

The spelling of 3658261 in words is "three million, six hundred fifty-eight thousand, two hundred sixty-one".