139838399 has 4 divisors (see below), whose sum is σ = 140009136. Its totient is φ = 139667664.

The previous prime is 139838393. The next prime is 139838441. The reversal of 139838399 is 993838931.

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 139838399 - 2⁴ = 139838383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139838399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139838393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84134 + ... + 85779.

It is an arithmetic number, because the mean of its divisors is an integer number (35002284).

Almost surely, 2^139838399 is an apocalyptic number.

139838399 is a deficient number, since it is larger than the sum of its proper divisors (170737).

139838399 is an equidigital number, since it uses as much as digits as its factorization.

139838399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170736.

The product of its digits is 1259712, while the sum is 53.

The square root of 139838399 is about 11825.3287057908. The cubic root of 139838399 is about 519.0495446358.

The spelling of 139838399 in words is "one hundred thirty-nine million, eight hundred thirty-eight thousand, three hundred ninety-nine".