138531450 has 24 divisors (see below), whose sum is σ = 343558368. Its totient is φ = 36941680.

The previous prime is 138531433. The next prime is 138531511. The reversal of 138531450 is 54135831.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 461622 + ... + 461921.

It is an arithmetic number, because the mean of its divisors is an integer number (14314932).

Almost surely, 2^138531450 is an apocalyptic number.

138531450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138531450 is an abundant number, since it is smaller than the sum of its proper divisors (205026918).

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

138531450 is a wasteful number, since it uses less digits than its factorization.

138531450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923558 (or 923553 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 138531450 is about 11769.9384025576. The cubic root of 138531450 is about 517.4274443776.

The spelling of 138531450 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, four hundred fifty".