63138918 has 16 divisors (see below), whose sum is σ = 133706160. Its totient is φ = 19808256.

The previous prime is 63138917. The next prime is 63138923. The reversal of 63138918 is 81983136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63138913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309403 + ... + 309606.

It is an arithmetic number, because the mean of its divisors is an integer number (8356635).

Almost surely, 2^63138918 is an apocalyptic number.

63138918 is an abundant number, since it is smaller than the sum of its proper divisors (70567242).

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

63138918 is a wasteful number, since it uses less digits than its factorization.

63138918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619031.

The product of its digits is 31104, while the sum is 39.

The square root of 63138918 is about 7946.0001258495. Note that the first 3 decimals coincide. The cubic root of 63138918 is about 398.1979731054.

The spelling of 63138918 in words is "sixty-three million, one hundred thirty-eight thousand, nine hundred eighteen".