861185044 has 24 divisors (see below), whose sum is σ = 1626831360. Its totient is φ = 397667424.

The previous prime is 861185029. The next prime is 861185047. The reversal of 861185044 is 440581168.

It is a junction number, because it is equal to n+sod(n) for n = 861184994 and 861185012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861185047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158724 + ... + 164059.

It is an arithmetic number, because the mean of its divisors is an integer number (67784640).

Almost surely, 2^861185044 is an apocalyptic number.

It is an amenable number.

861185044 is a deficient number, since it is larger than the sum of its proper divisors (765646316).

861185044 is a wasteful number, since it uses less digits than its factorization.

861185044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322839 (or 322837 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 861185044 is about 29345.9544741690. The cubic root of 861185044 is about 951.4051391100.

The spelling of 861185044 in words is "eight hundred sixty-one million, one hundred eighty-five thousand, forty-four".