861447 has 4 divisors (see below), whose sum is σ = 1148600. Its totient is φ = 574296.

The previous prime is 861439. The next prime is 861491. The reversal of 861447 is 744168.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 861447 - 2³ = 861439 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861447.

It is not an unprimeable number, because it can be changed into a prime (861437) 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, 143572 + ... + 143577.

It is an arithmetic number, because the mean of its divisors is an integer number (287150).

2⁸⁶¹⁴⁴⁷ is an apocalyptic number.

861447 is a deficient number, since it is larger than the sum of its proper divisors (287153).

861447 is a wasteful number, since it uses less digits than its factorization.

861447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287152.

The product of its digits is 5376, while the sum is 30.

The square root of 861447 is about 928.1416917691. The cubic root of 861447 is about 95.1501595739.

The spelling of 861447 in words is "eight hundred sixty-one thousand, four hundred forty-seven".