138581510 has 16 divisors (see below), whose sum is σ = 251737200. Its totient is φ = 54923616.

The previous prime is 138581503. The next prime is 138581519. The reversal of 138581510 is 15185831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138581519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62480 + ... + 64659.

It is an arithmetic number, because the mean of its divisors is an integer number (15733575).

Almost surely, 2^138581510 is an apocalyptic number.

138581510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138581510 is a deficient number, since it is larger than the sum of its proper divisors (113155690).

138581510 is a wasteful number, since it uses less digits than its factorization.

138581510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127255.

The product of its (nonzero) digits is 4800, while the sum is 32.

The square root of 138581510 is about 11772.0648146364. The cubic root of 138581510 is about 517.4897630747.

The spelling of 138581510 in words is "one hundred thirty-eight million, five hundred eighty-one thousand, five hundred ten".