138810993 has 8 divisors (see below), whose sum is σ = 186811488. Its totient is φ = 91675584.

The previous prime is 138810983. The next prime is 138811019. The reversal of 138810993 is 399018831.

It is a happy number.

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

It is not a de Polignac number, because 138810993 - 2¹² = 138806897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138810913) 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 7 ways as a sum of consecutive naturals, for example, 215896 + ... + 216537.

It is an arithmetic number, because the mean of its divisors is an integer number (23351436).

Almost surely, 2^138810993 is an apocalyptic number.

It is an amenable number.

138810993 is a deficient number, since it is larger than the sum of its proper divisors (48000495).

138810993 is a wasteful number, since it uses less digits than its factorization.

138810993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432543.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 138810993 is about 11781.8077135896. The cubic root of 138810993 is about 517.7752499650.

The spelling of 138810993 in words is "one hundred thirty-eight million, eight hundred ten thousand, nine hundred ninety-three".