75117839 has 4 divisors (see below), whose sum is σ = 78383856. Its totient is φ = 71851824.

The previous prime is 75117829. The next prime is 75117851. The reversal of 75117839 is 93871157.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93871157 = 211 ⋅444887.

It is a cyclic number.

It is not a de Polignac number, because 75117839 - 2¹² = 75113743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75117796 and 75117805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75117829) 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, 1632974 + ... + 1633019.

It is an arithmetic number, because the mean of its divisors is an integer number (19595964).

Almost surely, 2^75117839 is an apocalyptic number.

75117839 is a deficient number, since it is larger than the sum of its proper divisors (3266017).

75117839 is a wasteful number, since it uses less digits than its factorization.

75117839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266016.

The product of its digits is 52920, while the sum is 41.

The square root of 75117839 is about 8667.0548054111. The cubic root of 75117839 is about 421.9370821047.

The spelling of 75117839 in words is "seventy-five million, one hundred seventeen thousand, eight hundred thirty-nine".