861659240 has 32 divisors (see below), whose sum is σ = 2087867880. Its totient is φ = 318150912.

The previous prime is 861659237. The next prime is 861659251. The reversal of 861659240 is 42956168.

It is a happy number.

861659240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 351712516 + 509946724 = 18754^2 + 22582^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827999 + ... + 829038.

Almost surely, 2^861659240 is an apocalyptic number.

It is an amenable number.

861659240 is an abundant number, since it is smaller than the sum of its proper divisors (1226208640).

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

861659240 is a wasteful number, since it uses less digits than its factorization.

861659240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657061 (or 1657057 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 861659240 is about 29354.0327723466. The cubic root of 861659240 is about 951.5797317574.

The spelling of 861659240 in words is "eight hundred sixty-one million, six hundred fifty-nine thousand, two hundred forty".