861439420722 has 32 divisors (see below), whose sum is σ = 1771348233600. Its totient is φ = 279084953088.

The previous prime is 861439420697. The next prime is 861439420727. The reversal of 861439420722 is 227024934168.

It is not an unprimeable number, because it can be changed into a prime (861439420727) 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 15 ways as a sum of consecutive naturals, for example, 1882222 + ... + 2294697.

It is an arithmetic number, because the mean of its divisors is an integer number (55354632300).

Almost surely, 2^861439420722 is an apocalyptic number.

861439420722 is an abundant number, since it is smaller than the sum of its proper divisors (909908812878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861439420722 is a wasteful number, since it uses less digits than its factorization.

861439420722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177890.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 861439420722 in words is "eight hundred sixty-one billion, four hundred thirty-nine million, four hundred twenty thousand, seven hundred twenty-two".