138553250 has 32 divisors (see below), whose sum is σ = 282956544. Its totient is φ = 50382000.

The previous prime is 138553243. The next prime is 138553273. The reversal of 138553250 is 52355831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22442 + ... + 27941.

It is an arithmetic number, because the mean of its divisors is an integer number (8842392).

Almost surely, 2^138553250 is an apocalyptic number.

138553250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138553250 is an abundant number, since it is smaller than the sum of its proper divisors (144403294).

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

138553250 is a wasteful number, since it uses less digits than its factorization.

138553250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50411 (or 50401 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 138553250 is about 11770.8644542361. The cubic root of 138553250 is about 517.4545846086.

The spelling of 138553250 in words is "one hundred thirty-eight million, five hundred fifty-three thousand, two hundred fifty".