138752810 has 48 divisors (see below), whose sum is σ = 307639944. Its totient is φ = 44771328.

The previous prime is 138752773. The next prime is 138752833. The reversal of 138752810 is 18257831.

It can be written as a sum of positive squares in 4 ways, for example, as 138462289 + 290521 = 11767^2 + 539^2 .

It is a super-2 number, since 2×138752810² = 38504684565792200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

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 23 ways as a sum of consecutive naturals, for example, 2 + ... + 16658.

Almost surely, 2^138752810 is an apocalyptic number.

138752810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138752810 is an abundant number, since it is smaller than the sum of its proper divisors (168887134).

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

138752810 is a wasteful number, since it uses less digits than its factorization.

138752810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16695 (or 16688 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 138752810 is about 11779.3382666430. The cubic root of 138752810 is about 517.7028975602.

The spelling of 138752810 in words is "one hundred thirty-eight million, seven hundred fifty-two thousand, eight hundred ten".