138953506 has 8 divisors (see below), whose sum is σ = 208541520. Its totient is φ = 69439668.

The previous prime is 138953473. The next prime is 138953509. The reversal of 138953506 is 605359831.

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

It is not an unprimeable number, because it can be changed into a prime (138953509) 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, 13596 + ... + 21511.

It is an arithmetic number, because the mean of its divisors is an integer number (26067690).

Almost surely, 2^138953506 is an apocalyptic number.

138953506 is a deficient number, since it is larger than the sum of its proper divisors (69588014).

138953506 is a wasteful number, since it uses less digits than its factorization.

138953506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37088.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 138953506 is about 11787.8541728340. The cubic root of 138953506 is about 517.9523840292.

The spelling of 138953506 in words is "one hundred thirty-eight million, nine hundred fifty-three thousand, five hundred six".