3638455387 has 4 divisors (see below), whose sum is σ = 4158234736. Its totient is φ = 3118676040.

The previous prime is 3638455357. The next prime is 3638455393. The reversal of 3638455387 is 7835548363.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3638455387 - 2⁷ = 3638455259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3638455357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259889664 + ... + 259889677.

It is an arithmetic number, because the mean of its divisors is an integer number (1039558684).

Almost surely, 2^3638455387 is an apocalyptic number.

3638455387 is a deficient number, since it is larger than the sum of its proper divisors (519779349).

3638455387 is an equidigital number, since it uses as much as digits as its factorization.

3638455387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519779348.

The product of its digits is 7257600, while the sum is 52.

The square root of 3638455387 is about 60319.6103021231. The cubic root of 3638455387 is about 1538.0567194652.

The spelling of 3638455387 in words is "three billion, six hundred thirty-eight million, four hundred fifty-five thousand, three hundred eighty-seven".