861443867 has 4 divisors (see below), whose sum is σ = 861778680. Its totient is φ = 861109056.

The previous prime is 861443851. The next prime is 861443917. The reversal of 861443867 is 768344168.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 861443867 - 2⁴ = 861443851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861443827) 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, 163517 + ... + 168702.

It is an arithmetic number, because the mean of its divisors is an integer number (215444670).

Almost surely, 2^861443867 is an apocalyptic number.

861443867 is a deficient number, since it is larger than the sum of its proper divisors (334813).

861443867 is a wasteful number, since it uses less digits than its factorization.

861443867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334812.

The product of its digits is 774144, while the sum is 47.

The square root of 861443867 is about 29350.3640011500. The cubic root of 861443867 is about 951.5004422310.

The spelling of 861443867 in words is "eight hundred sixty-one million, four hundred forty-three thousand, eight hundred sixty-seven".