138401519 has 4 divisors (see below), whose sum is σ = 138812544. Its totient is φ = 137990496.

The previous prime is 138401513. The next prime is 138401561. The reversal of 138401519 is 915104831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138401519 - 2²⁴ = 121624303 is a prime.

It is a super-2 number, since 2×138401519² = 38309960923014722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138401513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205007 + ... + 205680.

It is an arithmetic number, because the mean of its divisors is an integer number (34703136).

Almost surely, 2^138401519 is an apocalyptic number.

138401519 is a deficient number, since it is larger than the sum of its proper divisors (411025).

138401519 is an equidigital number, since it uses as much as digits as its factorization.

138401519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411024.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 138401519 is about 11764.4174951419. The cubic root of 138401519 is about 517.2656257799.

The spelling of 138401519 in words is "one hundred thirty-eight million, four hundred one thousand, five hundred nineteen".