75921 has 4 divisors (see below), whose sum is σ = 101232. Its totient is φ = 50612.
The previous prime is 75913. The next prime is 75931. The reversal of 75921 is 12957.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 75921 - 23 = 75913 is a prime.
It is a D-number.
It is a junction number, because it is equal to n+sod(n) for n = 75891 and 75900.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 75921.
It is not an unprimeable number, because it can be changed into a prime (75931) 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, 12651 + ... + 12656.
It is an arithmetic number, because the mean of its divisors is an integer number (25308).
275921 is an apocalyptic number.
It is an amenable number.
75921 is a deficient number, since it is larger than the sum of its proper divisors (25311).
75921 is a wasteful number, since it uses less digits than its factorization.
75921 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 25310.
The product of its digits is 630, while the sum is 24.
The square root of 75921 is about 275.5376562287. The cubic root of 75921 is about 42.3435539971.
It can be divided in two parts, 759 and 21, that added together give a triangular number (780 = T39).
The spelling of 75921 in words is "seventy-five thousand, nine hundred twenty-one".
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