861647423 has 16 divisors (see below), whose sum is σ = 1066368576. Its totient is φ = 677963520.

The previous prime is 861647419. The next prime is 861647429. The reversal of 861647423 is 324746168.

It is not a de Polignac number, because 861647423 - 2² = 861647419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861647429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9686 + ... + 42627.

It is an arithmetic number, because the mean of its divisors is an integer number (66648036).

Almost surely, 2^861647423 is an apocalyptic number.

861647423 is a deficient number, since it is larger than the sum of its proper divisors (204721153).

861647423 is a wasteful number, since it uses less digits than its factorization.

861647423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52514.

The product of its digits is 193536, while the sum is 41.

The square root of 861647423 is about 29353.8314875588. The cubic root of 861647423 is about 951.5753816739.

The spelling of 861647423 in words is "eight hundred sixty-one million, six hundred forty-seven thousand, four hundred twenty-three".