138787734 has 8 divisors (see below), whose sum is σ = 277575480. Its totient is φ = 46262576.

The previous prime is 138787717. The next prime is 138787739. The reversal of 138787734 is 437787831.

It is a happy number.

138787734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

138787734 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138787739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11565639 + ... + 11565650.

It is an arithmetic number, because the mean of its divisors is an integer number (34696935).

Almost surely, 2^138787734 is an apocalyptic number.

138787734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138787734 is a wasteful number, since it uses less digits than its factorization.

138787734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23131294.

The product of its digits is 790272, while the sum is 48.

The square root of 138787734 is about 11780.8205996017. The cubic root of 138787734 is about 517.7463290873.

It can be divided in two parts, 13878 and 7734, that added together give a palindrome (21612).

The spelling of 138787734 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, seven hundred thirty-four".