861432936 has 288 divisors, whose sum is σ = 2835836640. Its totient is φ = 216082944.

The previous prime is 861432899. The next prime is 861432941. The reversal of 861432936 is 639234168.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12857175 + ... + 12857241.

It is an arithmetic number, because the mean of its divisors is an integer number (9846655).

Almost surely, 2^861432936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861432936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417918320).

861432936 is an abundant number, since it is smaller than the sum of its proper divisors (1974403704).

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

861432936 is a wasteful number, since it uses less digits than its factorization.

861432936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 121 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 861432936 is about 29350.1777848108. The cubic root of 861432936 is about 951.4964176332.

The spelling of 861432936 in words is "eight hundred sixty-one million, four hundred thirty-two thousand, nine hundred thirty-six".