138919 has 8 divisors (see below), whose sum is σ = 154512. Its totient is φ = 123840.

The previous prime is 138917. The next prime is 138923. The reversal of 138919 is 919831.

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 138919 - 2¹ = 138917 is a prime.

It is a super-2 number, since 2×138919² = 38596977122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138917) 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, 717 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (19314).

2¹³⁸⁹¹⁹ is an apocalyptic number.

138919 is a deficient number, since it is larger than the sum of its proper divisors (15593).

138919 is a wasteful number, since it uses less digits than its factorization.

138919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its digits is 1944, while the sum is 31.

The square root of 138919 is about 372.7183923554. The cubic root of 138919 is about 51.7909506511.

The spelling of 138919 in words is "one hundred thirty-eight thousand, nine hundred nineteen".