861439420723 has 4 divisors (see below), whose sum is σ = 984502195120. Its totient is φ = 738376646328.

The previous prime is 861439420697. The next prime is 861439420727. The reversal of 861439420723 is 327024934168.

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 861439420723 - 2⁵ = 861439420691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861439420727) 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, 61531387188 + ... + 61531387201.

It is an arithmetic number, because the mean of its divisors is an integer number (246125548780).

Almost surely, 2^861439420723 is an apocalyptic number.

861439420723 is a deficient number, since it is larger than the sum of its proper divisors (123062774397).

861439420723 is a wasteful number, since it uses less digits than its factorization.

861439420723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123062774396.

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 861439420723 in words is "eight hundred sixty-one billion, four hundred thirty-nine million, four hundred twenty thousand, seven hundred twenty-three".