138972207 has 8 divisors (see below), whose sum is σ = 202141440. Its totient is φ = 84225560.

The previous prime is 138972179. The next prime is 138972221. The reversal of 138972207 is 702279831.

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

It is a cyclic number.

It is not a de Polignac number, because 138972207 - 2¹² = 138968111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138972107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2105607 + ... + 2105672.

It is an arithmetic number, because the mean of its divisors is an integer number (25267680).

Almost surely, 2^138972207 is an apocalyptic number.

138972207 is a deficient number, since it is larger than the sum of its proper divisors (63169233).

138972207 is a wasteful number, since it uses less digits than its factorization.

138972207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211293.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 138972207 is about 11788.6473778801. The cubic root of 138972207 is about 517.9756191225.

The spelling of 138972207 in words is "one hundred thirty-eight million, nine hundred seventy-two thousand, two hundred seven".