861404508 has 36 divisors (see below), whose sum is σ = 2181918648. Its totient is φ = 286544160.

The previous prime is 861404507. The next prime is 861404519. The reversal of 861404508 is 805404168.

861404508 is a `hidden beast` number, since 8 + 6 + 140 + 4 + 508 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861404503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6691 + ... + 42042.

Almost surely, 2^861404508 is an apocalyptic number.

It is an amenable number.

861404508 is an abundant number, since it is smaller than the sum of its proper divisors (1320514140).

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

861404508 is a wasteful number, since it uses less digits than its factorization.

861404508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49234 (or 49229 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 861404508 is about 29349.6934907334. The cubic root of 861404508 is about 951.4859507949.

The spelling of 861404508 in words is "eight hundred sixty-one million, four hundred four thousand, five hundred eight".