138136810 has 32 divisors (see below), whose sum is σ = 286231680. Its totient is φ = 47017152.

The previous prime is 138136787. The next prime is 138136813. The reversal of 138136810 is 18631831.

It is a super-2 number, since 2×138136810² = 38163556553952200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138136813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2632 + ... + 16828.

It is an arithmetic number, because the mean of its divisors is an integer number (8944740).

Almost surely, 2^138136810 is an apocalyptic number.

138136810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138136810 is an abundant number, since it is smaller than the sum of its proper divisors (148094870).

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

138136810 is a wasteful number, since it uses less digits than its factorization.

138136810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14350.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 138136810 is about 11753.1617022825. The cubic root of 138136810 is about 516.9356384231.

The spelling of 138136810 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, eight hundred ten".