138659850 has 240 divisors, whose sum is σ = 453000768. Its totient is φ = 30792960.

The previous prime is 138659849. The next prime is 138659861. The reversal of 138659850 is 58956831.

138659850 is a `hidden beast` number, since 1 + 3 + 8 + 6 + 598 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 138659796 and 138659805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1899414 + ... + 1899486.

Almost surely, 2^138659850 is an apocalyptic number.

138659850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138659850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226500384).

138659850 is an abundant number, since it is smaller than the sum of its proper divisors (314340918).

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

138659850 is a wasteful number, since it uses less digits than its factorization.

138659850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 138659850 is about 11775.3917132298. The cubic root of 138659850 is about 517.5872568682.

The spelling of 138659850 in words is "one hundred thirty-eight million, six hundred fifty-nine thousand, eight hundred fifty".