861442019 has 8 divisors (see below), whose sum is σ = 879036192. Its totient is φ = 843897600.

The previous prime is 861442009. The next prime is 861442027. The reversal of 861442019 is 910244168.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861442019 is a prime.

It is a super-2 number, since 2×861442019² = 1484164704197592722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861442019.

It is not an unprimeable number, because it can be changed into a prime (861442009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23594 + ... + 47744.

It is an arithmetic number, because the mean of its divisors is an integer number (109879524).

Almost surely, 2^861442019 is an apocalyptic number.

861442019 is a deficient number, since it is larger than the sum of its proper divisors (17594173).

861442019 is a wasteful number, since it uses less digits than its factorization.

861442019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24877.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 861442019 is about 29350.3325194111. The cubic root of 861442019 is about 951.4997618330.

The spelling of 861442019 in words is "eight hundred sixty-one million, four hundred forty-two thousand, nineteen".