138284993 has 32 divisors (see below), whose sum is σ = 181757952. Its totient is φ = 102009600.

The previous prime is 138284989. The next prime is 138284999. The reversal of 138284993 is 399482831.

It is a happy number.

It is not a de Polignac number, because 138284993 - 2² = 138284989 is a prime.

It is a Duffinian number.

138284993 is a modest number, since divided by 84993 gives 1382 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138284999) 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 31 ways as a sum of consecutive naturals, for example, 199778 + ... + 200468.

It is an arithmetic number, because the mean of its divisors is an integer number (5679936).

Almost surely, 2^138284993 is an apocalyptic number.

It is an amenable number.

138284993 is a deficient number, since it is larger than the sum of its proper divisors (43472959).

138284993 is a wasteful number, since it uses less digits than its factorization.

138284993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its digits is 373248, while the sum is 47.

The square root of 138284993 is about 11759.4639758792. The cubic root of 138284993 is about 517.1204158655.

The spelling of 138284993 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, nine hundred ninety-three".