138949387 has 8 divisors (see below), whose sum is σ = 142410240. Its totient is φ = 135531240.

The previous prime is 138949361. The next prime is 138949403. The reversal of 138949387 is 783949831.

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 138949387 - 2⁷ = 138949259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138947387) 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, 4039 + ... + 17152.

It is an arithmetic number, because the mean of its divisors is an integer number (17801280).

Almost surely, 2^138949387 is an apocalyptic number.

138949387 is a deficient number, since it is larger than the sum of its proper divisors (3460853).

138949387 is an equidigital number, since it uses as much as digits as its factorization.

138949387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21353.

The product of its digits is 1306368, while the sum is 52.

The square root of 138949387 is about 11787.6794578068. The cubic root of 138949387 is about 517.9472660896.

The spelling of 138949387 in words is "one hundred thirty-eight million, nine hundred forty-nine thousand, three hundred eighty-seven".