7139905 has 8 divisors (see below), whose sum is σ = 8644392. Its totient is φ = 5660928.

The previous prime is 7139903. The next prime is 7139917. The reversal of 7139905 is 5099317.

It can be written as a sum of positive squares in 4 ways, for example, as 400689 + 6739216 = 633^2 + 2596^2 .

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 7139905 - 2¹ = 7139903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7139903) 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 7 ways as a sum of consecutive naturals, for example, 5754 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (1080549).

Almost surely, 2^7139905 is an apocalyptic number.

It is an amenable number.

7139905 is a deficient number, since it is larger than the sum of its proper divisors (1504487).

7139905 is a wasteful number, since it uses less digits than its factorization.

7139905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12755.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 7139905 is about 2672.0600666901. The cubic root of 7139905 is about 192.5591430124.

The spelling of 7139905 in words is "seven million, one hundred thirty-nine thousand, nine hundred five".