3640139 has 4 divisors (see below), whose sum is σ = 3645360. Its totient is φ = 3634920.

The previous prime is 3640121. The next prime is 3640151. The reversal of 3640139 is 9310463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9310463 = 263 ⋅35401.

It is a cyclic number.

It is not a de Polignac number, because 3640139 - 2¹² = 3636043 is a prime.

It is a super-2 number, since 2×3640139² = 26501223878642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1367 + ... + 3024.

It is an arithmetic number, because the mean of its divisors is an integer number (911340).

Almost surely, 2^3640139 is an apocalyptic number.

3640139 is a deficient number, since it is larger than the sum of its proper divisors (5221).

3640139 is an equidigital number, since it uses as much as digits as its factorization.

3640139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 3640139 is about 1907.9148303842. The cubic root of 3640139 is about 153.8293916545.

The spelling of 3640139 in words is "three million, six hundred forty thousand, one hundred thirty-nine".