891478542 has 16 divisors (see below), whose sum is σ = 1783307520. Its totient is φ = 297101112.

The previous prime is 891478519. The next prime is 891478543. The reversal of 891478542 is 245874198.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 891478491 and 891478500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891478543) 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, 28059 + ... + 50697.

It is an arithmetic number, because the mean of its divisors is an integer number (111456720).

Almost surely, 2^891478542 is an apocalyptic number.

891478542 is an abundant number, since it is smaller than the sum of its proper divisors (891828978).

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

891478542 is a wasteful number, since it uses less digits than its factorization.

891478542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29207.

The product of its digits is 645120, while the sum is 48.

The square root of 891478542 is about 29857.6379172901. The cubic root of 891478542 is about 962.4325397595.

The spelling of 891478542 in words is "eight hundred ninety-one million, four hundred seventy-eight thousand, five hundred forty-two".