861238404 has 288 divisors, whose sum is σ = 2641766400. Its totient is φ = 234178560.

The previous prime is 861238397. The next prime is 861238429. The reversal of 861238404 is 404832168.

861238404 is a `hidden beast` number, since 8 + 612 + 38 + 4 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9676792 + ... + 9676880.

It is an arithmetic number, because the mean of its divisors is an integer number (9172800).

Almost surely, 2^861238404 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 861238404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320883200).

861238404 is an abundant number, since it is smaller than the sum of its proper divisors (1780527996).

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

861238404 is a wasteful number, since it uses less digits than its factorization.

861238404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 861238404 is about 29346.8636143626. The cubic root of 861238404 is about 951.4247887506.

The spelling of 861238404 in words is "eight hundred sixty-one million, two hundred thirty-eight thousand, four hundred four".