861047 has 4 divisors (see below), whose sum is σ = 939336. Its totient is φ = 782760.

The previous prime is 861043. The next prime is 861053. The reversal of 861047 is 740168.

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

It is not a de Polignac number, because 861047 - 2² = 861043 is a prime.

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 861047.

It is not an unprimeable number, because it can be changed into a prime (861043) 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, 39128 + ... + 39149.

It is an arithmetic number, because the mean of its divisors is an integer number (234834).

2⁸⁶¹⁰⁴⁷ is an apocalyptic number.

861047 is a deficient number, since it is larger than the sum of its proper divisors (78289).

861047 is a wasteful number, since it uses less digits than its factorization.

861047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78288.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 861047 is about 927.9261824089. The cubic root of 861047 is about 95.1354301105.

The spelling of 861047 in words is "eight hundred sixty-one thousand, forty-seven".