138287380 has 48 divisors (see below), whose sum is σ = 362065536. Its totient is φ = 43102080.

The previous prime is 138287363. The next prime is 138287393. The reversal of 138287380 is 83782831.

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 15 ways as a sum of consecutive naturals, for example, 43359 + ... + 46438.

It is an arithmetic number, because the mean of its divisors is an integer number (7543032).

Almost surely, 2^138287380 is an apocalyptic number.

138287380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138287380 is an abundant number, since it is smaller than the sum of its proper divisors (223778156).

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

138287380 is a wasteful number, since it uses less digits than its factorization.

138287380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89824 (or 89822 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 138287380 is about 11759.5654681625. The cubic root of 138287380 is about 517.1233912650.

The spelling of 138287380 in words is "one hundred thirty-eight million, two hundred eighty-seven thousand, three hundred eighty".