312139505 has 8 divisors (see below), whose sum is σ = 394281600. Its totient is φ = 236568816.

The previous prime is 312139493. The next prime is 312139579. The reversal of 312139505 is 505931213.

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 312139505 - 2⁸ = 312139249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1642745 + ... + 1642934.

It is an arithmetic number, because the mean of its divisors is an integer number (49285200).

Almost surely, 2^312139505 is an apocalyptic number.

It is an amenable number.

312139505 is a deficient number, since it is larger than the sum of its proper divisors (82142095).

312139505 is a wasteful number, since it uses less digits than its factorization.

312139505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3285703.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 312139505 is about 17667.4702490198. The cubic root of 312139505 is about 678.3433613504.

The spelling of 312139505 in words is "three hundred twelve million, one hundred thirty-nine thousand, five hundred five".