138972434 has 8 divisors (see below), whose sum is σ = 208531260. Its totient is φ = 69462016.

The previous prime is 138972419. The next prime is 138972439. The reversal of 138972434 is 434279831.

It can be written as a sum of positive squares in 2 ways, for example, as 136072225 + 2900209 = 11665^2 + 1703^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138972391 and 138972400.

It is not an unprimeable number, because it can be changed into a prime (138972439) 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, 3779 + ... + 17094.

Almost surely, 2^138972434 is an apocalyptic number.

138972434 is a deficient number, since it is larger than the sum of its proper divisors (69558826).

138972434 is a wasteful number, since it uses less digits than its factorization.

138972434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24204.

The product of its digits is 145152, while the sum is 41.

The square root of 138972434 is about 11788.6570057831. The cubic root of 138972434 is about 517.9759011463.

The spelling of 138972434 in words is "one hundred thirty-eight million, nine hundred seventy-two thousand, four hundred thirty-four".