138949580 has 48 divisors (see below), whose sum is σ = 363799296. Its totient is φ = 43308480.

The previous prime is 138949579. The next prime is 138949583. The reversal of 138949580 is 85949831.

It is not an unprimeable number, because it can be changed into a prime (138949583) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 43574 + ... + 46653.

It is an arithmetic number, because the mean of its divisors is an integer number (7579152).

Almost surely, 2^138949580 is an apocalyptic number.

138949580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138949580 is an abundant number, since it is smaller than the sum of its proper divisors (224849716).

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

138949580 is a wasteful number, since it uses less digits than its factorization.

138949580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90254 (or 90252 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 138949580 is about 11787.6876443177. The cubic root of 138949580 is about 517.9475058982.

The spelling of 138949580 in words is "one hundred thirty-eight million, nine hundred forty-nine thousand, five hundred eighty".