1638823468 has 12 divisors (see below), whose sum is σ = 2870436520. Its totient is φ = 818698752.

The previous prime is 1638823429. The next prime is 1638823469. The reversal of 1638823468 is 8643288361.

It is not an unprimeable number, because it can be changed into a prime (1638823469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173058 + ... + 182281.

Almost surely, 2^1638823468 is an apocalyptic number.

It is an amenable number.

1638823468 is a deficient number, since it is larger than the sum of its proper divisors (1231613052).

1638823468 is a wasteful number, since it uses less digits than its factorization.

1638823468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356496 (or 356494 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 49.

The square root of 1638823468 is about 40482.3846629617. The cubic root of 1638823468 is about 1178.9916378372.

The spelling of 1638823468 in words is "one billion, six hundred thirty-eight million, eight hundred twenty-three thousand, four hundred sixty-eight".