138991299 has 8 divisors (see below), whose sum is σ = 188088000. Its totient is φ = 91277736.

The previous prime is 138991291. The next prime is 138991301. The reversal of 138991299 is 992199831.

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

It is not a de Polignac number, because 138991299 - 2³ = 138991291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138991291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345549 + ... + 345950.

It is an arithmetic number, because the mean of its divisors is an integer number (23511000).

Almost surely, 2^138991299 is an apocalyptic number.

138991299 is a deficient number, since it is larger than the sum of its proper divisors (49096701).

138991299 is an equidigital number, since it uses as much as digits as its factorization.

138991299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691569.

The product of its digits is 314928, while the sum is 51.

The square root of 138991299 is about 11789.4571121829. The cubic root of 138991299 is about 517.9993378643. Note that the first 3 decimals are identical.

The spelling of 138991299 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, two hundred ninety-nine".