138731486 has 4 divisors (see below), whose sum is σ = 208097232. Its totient is φ = 69365742.

The previous prime is 138731477. The next prime is 138731501. The reversal of 138731486 is 684137831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 684137831 = 13 ⋅52625987.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34682870 + ... + 34682873.

It is an arithmetic number, because the mean of its divisors is an integer number (52024308).

Almost surely, 2^138731486 is an apocalyptic number.

138731486 is a deficient number, since it is larger than the sum of its proper divisors (69365746).

138731486 is an equidigital number, since it uses as much as digits as its factorization.

138731486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69365745.

The product of its digits is 96768, while the sum is 41.

The square root of 138731486 is about 11778.4330876395. The cubic root of 138731486 is about 517.6763754255.

The spelling of 138731486 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, four hundred eighty-six".