138812890 has 8 divisors (see below), whose sum is σ = 249863220. Its totient is φ = 55525152.

The previous prime is 138812887. The next prime is 138812893. The reversal of 138812890 is 98218831.

It is an interprime number because it is at equal distance from previous prime (138812887) and next prime (138812893).

It can be written as a sum of positive squares in 2 ways, for example, as 121198081 + 17614809 = 11009^2 + 4197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138812893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6940635 + ... + 6940654.

Almost surely, 2^138812890 is an apocalyptic number.

138812890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138812890 is a deficient number, since it is larger than the sum of its proper divisors (111050330).

138812890 is a wasteful number, since it uses less digits than its factorization.

138812890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13881296.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 138812890 is about 11781.8882187873. Note that the first 3 decimals coincide. The cubic root of 138812890 is about 517.7776086042. Note that the first 3 decimals are identical.

The spelling of 138812890 in words is "one hundred thirty-eight million, eight hundred twelve thousand, eight hundred ninety".