138831526 has 8 divisors (see below), whose sum is σ = 215428320. Its totient is φ = 67022088.

The previous prime is 138831523. The next prime is 138831551. The reversal of 138831526 is 625138831.

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

It is a super-2 number, since 2×138831526² = 38548385222977352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138831523) 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, 1196766 + ... + 1196881.

It is an arithmetic number, because the mean of its divisors is an integer number (26928540).

Almost surely, 2^138831526 is an apocalyptic number.

138831526 is a deficient number, since it is larger than the sum of its proper divisors (76596794).

138831526 is a wasteful number, since it uses less digits than its factorization.

138831526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393678.

The product of its digits is 34560, while the sum is 37.

The square root of 138831526 is about 11782.6790671731. The cubic root of 138831526 is about 517.8007785748.

The spelling of 138831526 in words is "one hundred thirty-eight million, eight hundred thirty-one thousand, five hundred twenty-six".