1638064386 has 24 divisors (see below), whose sum is σ = 4056159744. Its totient is φ = 468018360.

The previous prime is 1638064369. The next prime is 1638064409. The reversal of 1638064386 is 6834608361.

1638064386 is a `hidden beast` number, since 1 + 638 + 0 + 6 + 4 + 3 + 8 + 6 = 666.

It is a super-3 number, since 3×1638064386³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6500130 + ... + 6500381.

It is an arithmetic number, because the mean of its divisors is an integer number (169006656).

Almost surely, 2^1638064386 is an apocalyptic number.

1638064386 is an abundant number, since it is smaller than the sum of its proper divisors (2418095358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1638064386 is a wasteful number, since it uses less digits than its factorization.

1638064386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13000526 (or 13000523 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1638064386 is about 40473.0081165213. The cubic root of 1638064386 is about 1178.8095784594.

The spelling of 1638064386 in words is "one billion, six hundred thirty-eight million, sixty-four thousand, three hundred eighty-six".