891623434 has 16 divisors (see below), whose sum is σ = 1442091168. Its totient is φ = 411010992.

The previous prime is 891623413. The next prime is 891623443. The reversal of 891623434 is 434326198.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769 + ... + 42235.

It is an arithmetic number, because the mean of its divisors is an integer number (90130698).

Almost surely, 2^891623434 is an apocalyptic number.

891623434 is a deficient number, since it is larger than the sum of its proper divisors (550467734).

891623434 is a wasteful number, since it uses less digits than its factorization.

891623434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42309.

The product of its digits is 124416, while the sum is 40.

The square root of 891623434 is about 29860.0641995291. The cubic root of 891623434 is about 962.4846783191.

The spelling of 891623434 in words is "eight hundred ninety-one million, six hundred twenty-three thousand, four hundred thirty-four".