138787893 has 6 divisors (see below), whose sum is σ = 200471414. Its totient is φ = 92525256.

The previous prime is 138787861. The next prime is 138787921. The reversal of 138787893 is 398787831.

It can be written as a sum of positive squares in only one way, i.e., 131400369 + 7387524 = 11463^2 + 2718^2 .

It is not a de Polignac number, because 138787893 - 2⁵ = 138787861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138787853) 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 5 ways as a sum of consecutive naturals, for example, 7710430 + ... + 7710447.

Almost surely, 2^138787893 is an apocalyptic number.

It is an amenable number.

138787893 is a deficient number, since it is larger than the sum of its proper divisors (61683521).

138787893 is a wasteful number, since it uses less digits than its factorization.

138787893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15420883 (or 15420880 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 138787893 is about 11780.8273478563. The cubic root of 138787893 is about 517.7465268032.

The spelling of 138787893 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, eight hundred ninety-three".