138888650 has 24 divisors (see below), whose sum is σ = 258685824. Its totient is φ = 55479600.

The previous prime is 138888611. The next prime is 138888653. The reversal of 138888650 is 56888831.

It is a junction number, because it is equal to n+sod(n) for n = 138888595 and 138888604.

It is not an unprimeable number, because it can be changed into a prime (138888653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48149 + ... + 50951.

It is an arithmetic number, because the mean of its divisors is an integer number (10778576).

Almost surely, 2^138888650 is an apocalyptic number.

138888650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138888650 is a deficient number, since it is larger than the sum of its proper divisors (119797174).

138888650 is a wasteful number, since it uses less digits than its factorization.

138888650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806 (or 3801 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 138888650 is about 11785.1028845742. The cubic root of 138888650 is about 517.8717874121.

The spelling of 138888650 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, six hundred fifty".