861437652 has 24 divisors (see below), whose sum is σ = 2011146816. Its totient is φ = 286985088.

The previous prime is 861437639. The next prime is 861437657. The reversal of 861437652 is 256734168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861437657) 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 7 ways as a sum of consecutive naturals, for example, 3313 + ... + 41639.

It is an arithmetic number, because the mean of its divisors is an integer number (83797784).

Almost surely, 2^861437652 is an apocalyptic number.

It is an amenable number.

861437652 is an abundant number, since it is smaller than the sum of its proper divisors (1149709164).

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

861437652 is a wasteful number, since it uses less digits than its factorization.

861437652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40207 (or 40205 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 861437652 is about 29350.2581249297. The cubic root of 861437652 is about 951.4981539838.

The spelling of 861437652 in words is "eight hundred sixty-one million, four hundred thirty-seven thousand, six hundred fifty-two".