138413905 has 8 divisors (see below), whose sum is σ = 189824832. Its totient is φ = 94912368.

The previous prime is 138413903. The next prime is 138413911. The reversal of 138413905 is 509314831.

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 138413905 - 2¹ = 138413903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138413903) 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, 1977307 + ... + 1977376.

It is an arithmetic number, because the mean of its divisors is an integer number (23728104).

Almost surely, 2^138413905 is an apocalyptic number.

It is an amenable number.

138413905 is a deficient number, since it is larger than the sum of its proper divisors (51410927).

138413905 is an equidigital number, since it uses as much as digits as its factorization.

138413905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954695.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 138413905 is about 11764.9439012687. The cubic root of 138413905 is about 517.2810559115.

The spelling of 138413905 in words is "one hundred thirty-eight million, four hundred thirteen thousand, nine hundred five".