3640191 has 8 divisors (see below), whose sum is σ = 5109120. Its totient is φ = 2299032.

The previous prime is 3640181. The next prime is 3640207. The reversal of 3640191 is 1910463.

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

It is not a de Polignac number, because 3640191 - 2¹⁵ = 3607423 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640121) 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, 31875 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (638640).

Almost surely, 2^3640191 is an apocalyptic number.

3640191 is a deficient number, since it is larger than the sum of its proper divisors (1468929).

3640191 is a wasteful number, since it uses less digits than its factorization.

3640191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63885.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 3640191 is about 1907.9284577782. The cubic root of 3640191 is about 153.8301241440.

The spelling of 3640191 in words is "three million, six hundred forty thousand, one hundred ninety-one".