138850440 has 128 divisors (see below), whose sum is σ = 433382400. Its totient is φ = 35562240.

The previous prime is 138850429. The next prime is 138850469. The reversal of 138850440 is 44058831.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366171 + ... + 366549.

It is an arithmetic number, because the mean of its divisors is an integer number (3385800).

Almost surely, 2^138850440 is an apocalyptic number.

138850440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138850440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216691200).

138850440 is an abundant number, since it is smaller than the sum of its proper divisors (294531960).

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

138850440 is a wasteful number, since it uses less digits than its factorization.

138850440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 138850440 is about 11783.4816586610. The cubic root of 138850440 is about 517.8242920603.

The spelling of 138850440 in words is "one hundred thirty-eight million, eight hundred fifty thousand, four hundred forty".