73861 has 4 divisors (see below), whose sum is σ = 74412. Its totient is φ = 73312.

The previous prime is 73859. The next prime is 73867. The reversal of 73861 is 16837.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16837 = 113 ⋅149.

It can be written as a sum of positive squares in 2 ways, for example, as 8836 + 65025 = 94^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 73861 - 2¹ = 73859 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (18603).

2⁷³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

73861 is a deficient number, since it is larger than the sum of its proper divisors (551).

73861 is a wasteful number, since it uses less digits than its factorization.

73861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its digits is 1008, while the sum is 25.

The square root of 73861 is about 271.7738030054. The cubic root of 73861 is about 41.9570611806.

The spelling of 73861 in words is "seventy-three thousand, eight hundred sixty-one".