1638138910 has 16 divisors (see below), whose sum is σ = 2979050256. Its totient is φ = 648499968.

The previous prime is 1638138877. The next prime is 1638138949. The reversal of 1638138910 is 198318361.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 843432 + ... + 845371.

It is an arithmetic number, because the mean of its divisors is an integer number (186190641).

Almost surely, 2^1638138910 is an apocalyptic number.

1638138910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1638138910 is a deficient number, since it is larger than the sum of its proper divisors (1340911346).

1638138910 is a wasteful number, since it uses less digits than its factorization.

1638138910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688907.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1638138910 is about 40473.9287690236. The cubic root of 1638138910 is about 1178.8274548981.

The spelling of 1638138910 in words is "one billion, six hundred thirty-eight million, one hundred thirty-eight thousand, nine hundred ten".