139215439 has 4 divisors (see below), whose sum is σ = 151871400. Its totient is φ = 126559480.

The previous prime is 139215437. The next prime is 139215443. The reversal of 139215439 is 934512931.

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 139215439 - 2¹ = 139215437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139215398 and 139215407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139215437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6327964 + ... + 6327985.

It is an arithmetic number, because the mean of its divisors is an integer number (37967850).

Almost surely, 2^139215439 is an apocalyptic number.

139215439 is a deficient number, since it is larger than the sum of its proper divisors (12655961).

139215439 is a wasteful number, since it uses less digits than its factorization.

139215439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12655960.

The product of its digits is 29160, while the sum is 37.

The square root of 139215439 is about 11798.9592337630. The cubic root of 139215439 is about 518.2776335024.

The spelling of 139215439 in words is "one hundred thirty-nine million, two hundred fifteen thousand, four hundred thirty-nine".