1634638849 has 8 divisors (see below), whose sum is σ = 1678012160. Its totient is φ = 1591832736.

The previous prime is 1634638787. The next prime is 1634638877. The reversal of 1634638849 is 9488364361.

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

It is a cyclic number.

It is not a de Polignac number, because 1634638849 - 2²¹ = 1632541697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1634638796 and 1634638805.

It is not an unprimeable number, because it can be changed into a prime (1634638949) 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 7 ways as a sum of consecutive naturals, for example, 135957 + ... + 147490.

It is an arithmetic number, because the mean of its divisors is an integer number (209751520).

Almost surely, 2^1634638849 is an apocalyptic number.

It is an amenable number.

1634638849 is a deficient number, since it is larger than the sum of its proper divisors (43373311).

1634638849 is an equidigital number, since it uses as much as digits as its factorization.

1634638849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283599.

The product of its digits is 2985984, while the sum is 52.

The square root of 1634638849 is about 40430.6671847003. The cubic root of 1634638849 is about 1177.9872921187.

The spelling of 1634638849 in words is "one billion, six hundred thirty-four million, six hundred thirty-eight thousand, eight hundred forty-nine".