3640438279 has 2 divisors, whose sum is σ = 3640438280. Its totient is φ = 3640438278.

The previous prime is 3640438253. The next prime is 3640438301. The reversal of 3640438279 is 9728340463.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3640438279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640438979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820219139 + 1820219140.

It is an arithmetic number, because the mean of its divisors is an integer number (1820219140).

Almost surely, 2^3640438279 is an apocalyptic number.

3640438279 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640438279 is an equidigital number, since it uses as much as digits as its factorization.

3640438279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 46.

The square root of 3640438279 is about 60336.0446085091. The cubic root of 3640438279 is about 1538.3360730351.

The spelling of 3640438279 in words is "three billion, six hundred forty million, four hundred thirty-eight thousand, two hundred seventy-nine".