75905139 has 4 divisors (see below), whose sum is σ = 101206856. Its totient is φ = 50603424.

The previous prime is 75905131. The next prime is 75905149. The reversal of 75905139 is 93150957.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93150957 = 3 ⋅31050319.

It is not a de Polignac number, because 75905139 - 2³ = 75905131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75905097 and 75905106.

It is not an unprimeable number, because it can be changed into a prime (75905131) 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, 12650854 + ... + 12650859.

It is an arithmetic number, because the mean of its divisors is an integer number (25301714).

Almost surely, 2^75905139 is an apocalyptic number.

75905139 is a deficient number, since it is larger than the sum of its proper divisors (25301717).

75905139 is a wasteful number, since it uses less digits than its factorization.

75905139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25301716.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 75905139 is about 8712.3555368224. The cubic root of 75905139 is about 423.4060506383.

The spelling of 75905139 in words is "seventy-five million, nine hundred five thousand, one hundred thirty-nine".