891994142 has 16 divisors (see below), whose sum is σ = 1503563040. Its totient is φ = 393789792.

The previous prime is 891994141. The next prime is 891994157. The reversal of 891994142 is 241499198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891994141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745217 + ... + 746412.

It is an arithmetic number, because the mean of its divisors is an integer number (93972690).

Almost surely, 2^891994142 is an apocalyptic number.

891994142 is a deficient number, since it is larger than the sum of its proper divisors (611568898).

891994142 is a wasteful number, since it uses less digits than its factorization.

891994142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491667.

The product of its digits is 186624, while the sum is 47.

The square root of 891994142 is about 29866.2709758014. The cubic root of 891994142 is about 962.6180497699.

The spelling of 891994142 in words is "eight hundred ninety-one million, nine hundred ninety-four thousand, one hundred forty-two".