138434078894 has 8 divisors (see below), whose sum is σ = 210750388968. Its totient is φ = 68183949240.

The previous prime is 138434078863. The next prime is 138434078957. The reversal of 138434078894 is 498870434831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516544937 + ... + 516545204.

It is an arithmetic number, because the mean of its divisors is an integer number (26343798621).

Almost surely, 2^138434078894 is an apocalyptic number.

138434078894 is a deficient number, since it is larger than the sum of its proper divisors (72316310074).

138434078894 is a wasteful number, since it uses less digits than its factorization.

138434078894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033090210.

The product of its (nonzero) digits is 18579456, while the sum is 59.

The spelling of 138434078894 in words is "one hundred thirty-eight billion, four hundred thirty-four million, seventy-eight thousand, eight hundred ninety-four".