1638225884 has 12 divisors (see below), whose sum is σ = 2907274608. Its totient is φ = 807576000.

The previous prime is 1638225877. The next prime is 1638225947. The reversal of 1638225884 is 4885228361.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883917 + ... + 2884484.

It is an arithmetic number, because the mean of its divisors is an integer number (242272884).

Almost surely, 2^1638225884 is an apocalyptic number.

It is an amenable number.

1638225884 is a deficient number, since it is larger than the sum of its proper divisors (1269048724).

1638225884 is a wasteful number, since it uses less digits than its factorization.

1638225884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5768476 (or 5768474 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 1638225884 is about 40475.0031995057. The cubic root of 1638225884 is about 1178.8483170941.

The spelling of 1638225884 in words is "one billion, six hundred thirty-eight million, two hundred twenty-five thousand, eight hundred eighty-four".