861934940 has 24 divisors (see below), whose sum is σ = 1826674080. Its totient is φ = 341610048.

The previous prime is 861934937. The next prime is 861934963. The reversal of 861934940 is 49439168.

It is a junction number, because it is equal to n+sod(n) for n = 861934891 and 861934900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195512 + ... + 199871.

It is an arithmetic number, because the mean of its divisors is an integer number (76111420).

Almost surely, 2^861934940 is an apocalyptic number.

It is an amenable number.

861934940 is an abundant number, since it is smaller than the sum of its proper divisors (964739140).

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

861934940 is a wasteful number, since it uses less digits than its factorization.

861934940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395501 (or 395499 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 861934940 is about 29358.7285147024. The cubic root of 861934940 is about 951.6812113772.

The spelling of 861934940 in words is "eight hundred sixty-one million, nine hundred thirty-four thousand, nine hundred forty".