138781510 has 32 divisors (see below), whose sum is σ = 300522240. Its totient is φ = 45077472.

The previous prime is 138781441. The next prime is 138781519. The reversal of 138781510 is 15187831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138781519) 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, 50844 + ... + 53503.

It is an arithmetic number, because the mean of its divisors is an integer number (9391320).

Almost surely, 2^138781510 is an apocalyptic number.

138781510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138781510 is an abundant number, since it is smaller than the sum of its proper divisors (161740730).

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

138781510 is a wasteful number, since it uses less digits than its factorization.

138781510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104380.

The product of its (nonzero) digits is 6720, while the sum is 34.

The square root of 138781510 is about 11780.5564384710. The cubic root of 138781510 is about 517.7385894473.

The spelling of 138781510 in words is "one hundred thirty-eight million, seven hundred eighty-one thousand, five hundred ten".