727861 has 4 divisors (see below), whose sum is σ = 744832. Its totient is φ = 710892.

The previous prime is 727847. The next prime is 727877. The reversal of 727861 is 168727.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 168727 = 13 ⋅12979.

It is a cyclic number.

It is not a de Polignac number, because 727861 - 2⁷ = 727733 is a prime.

It is an Ulam number.

It is a Duffinian number.

727861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (727891) 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 3 ways as a sum of consecutive naturals, for example, 8421 + ... + 8506.

It is an arithmetic number, because the mean of its divisors is an integer number (186208).

2⁷²⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

727861 is a deficient number, since it is larger than the sum of its proper divisors (16971).

727861 is a wasteful number, since it uses less digits than its factorization.

727861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16970.

The product of its digits is 4704, while the sum is 31.

The square root of 727861 is about 853.1477011632. The cubic root of 727861 is about 89.9531031394.

The spelling of 727861 in words is "seven hundred twenty-seven thousand, eight hundred sixty-one".