138991262 has 8 divisors (see below), whose sum is σ = 210078792. Its totient is φ = 68965000.

The previous prime is 138991253. The next prime is 138991291. The reversal of 138991262 is 262199831.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264989 + ... + 265512.

It is an arithmetic number, because the mean of its divisors is an integer number (26259849).

Almost surely, 2^138991262 is an apocalyptic number.

138991262 is a deficient number, since it is larger than the sum of its proper divisors (71087530).

138991262 is a wasteful number, since it uses less digits than its factorization.

138991262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530634.

The product of its digits is 46656, while the sum is 41.

The square root of 138991262 is about 11789.4555429842. The cubic root of 138991262 is about 517.9992918999. Note that the first 3 decimals are identical.

The spelling of 138991262 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, two hundred sixty-two".