915139439 has 8 divisors (see below), whose sum is σ = 922866672. Its totient is φ = 907441920.

The previous prime is 915139429. The next prime is 915139441. The reversal of 915139439 is 934931519.

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 915139439 - 2¹² = 915135343 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 915139439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915139429) 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, 56732 + ... + 71054.

It is an arithmetic number, because the mean of its divisors is an integer number (115358334).

Almost surely, 2^915139439 is an apocalyptic number.

915139439 is a deficient number, since it is larger than the sum of its proper divisors (7727233).

915139439 is a wasteful number, since it uses less digits than its factorization.

915139439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14857.

The product of its digits is 131220, while the sum is 44.

The square root of 915139439 is about 30251.2716922777. The cubic root of 915139439 is about 970.8730012162.

The spelling of 915139439 in words is "nine hundred fifteen million, one hundred thirty-nine thousand, four hundred thirty-nine".