861907420 has 24 divisors (see below), whose sum is σ = 1974552048. Its totient is φ = 313420800.

The previous prime is 861907381. The next prime is 861907427. The reversal of 861907420 is 24709168.

It is a self number, because there is not a number n which added to its sum of digits gives 861907420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861907427) 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 7 ways as a sum of consecutive naturals, for example, 1958661 + ... + 1959100.

It is an arithmetic number, because the mean of its divisors is an integer number (82273002).

Almost surely, 2^861907420 is an apocalyptic number.

It is an amenable number.

861907420 is an abundant number, since it is smaller than the sum of its proper divisors (1112644628).

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

861907420 is a wasteful number, since it uses less digits than its factorization.

861907420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917781 (or 3917779 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 861907420 is about 29358.2598258139. The cubic root of 861907420 is about 951.6710827915.

The spelling of 861907420 in words is "eight hundred sixty-one million, nine hundred seven thousand, four hundred twenty".