138413491 has 8 divisors (see below), whose sum is σ = 145325520. Its totient is φ = 131644128.

The previous prime is 138413489. The next prime is 138413497. The reversal of 138413491 is 194314831.

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 138413491 - 2¹ = 138413489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138413497) 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, 33676 + ... + 37561.

It is an arithmetic number, because the mean of its divisors is an integer number (18165690).

Almost surely, 2^138413491 is an apocalyptic number.

138413491 is a deficient number, since it is larger than the sum of its proper divisors (6912029).

138413491 is an equidigital number, since it uses as much as digits as its factorization.

138413491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71333.

The product of its digits is 10368, while the sum is 34.

The square root of 138413491 is about 11764.9263066115. The cubic root of 138413491 is about 517.2805401767.

The spelling of 138413491 in words is "one hundred thirty-eight million, four hundred thirteen thousand, four hundred ninety-one".