861634434 has 32 divisors (see below), whose sum is σ = 1782829440. Its totient is φ = 277424000.

The previous prime is 861634381. The next prime is 861634481. The reversal of 861634434 is 434436168.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 861634392 and 861634401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7507 + ... + 42185.

It is an arithmetic number, because the mean of its divisors is an integer number (55713420).

Almost surely, 2^861634434 is an apocalyptic number.

861634434 is an abundant number, since it is smaller than the sum of its proper divisors (921195006).

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

861634434 is a wasteful number, since it uses less digits than its factorization.

861634434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34826.

The product of its digits is 165888, while the sum is 39.

The square root of 861634434 is about 29353.6102379247. The cubic root of 861634434 is about 951.5706001068.

The spelling of 861634434 in words is "eight hundred sixty-one million, six hundred thirty-four thousand, four hundred thirty-four".