138459750 has 128 divisors (see below), whose sum is σ = 406328832. Its totient is φ = 30960000.

The previous prime is 138459749. The next prime is 138459773. The reversal of 138459750 is 57954831.

It is a super-2 number, since 2×138459750² = 38342204740125000, which contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 106605 + ... + 107895.

It is an arithmetic number, because the mean of its divisors is an integer number (3174444).

Almost surely, 2^138459750 is an apocalyptic number.

138459750 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 138459750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203164416).

138459750 is an abundant number, since it is smaller than the sum of its proper divisors (267869082).

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

138459750 is a wasteful number, since it uses less digits than its factorization.

138459750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 138459750 is about 11766.8921130433. The cubic root of 138459750 is about 517.3381603193.

The spelling of 138459750 in words is "one hundred thirty-eight million, four hundred fifty-nine thousand, seven hundred fifty".