891949838 has 8 divisors (see below), whose sum is σ = 1440842088. Its totient is φ = 411669144.

The previous prime is 891949831. The next prime is 891949841. The reversal of 891949838 is 838949198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891949831) 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 3 ways as a sum of consecutive naturals, for example, 17152856 + ... + 17152907.

It is an arithmetic number, because the mean of its divisors is an integer number (180105261).

Almost surely, 2^891949838 is an apocalyptic number.

891949838 is a deficient number, since it is larger than the sum of its proper divisors (548892250).

891949838 is a wasteful number, since it uses less digits than its factorization.

891949838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34305778.

The product of its digits is 4478976, while the sum is 59.

The square root of 891949838 is about 29865.5292603362. The cubic root of 891949838 is about 962.6021122451.

The spelling of 891949838 in words is "eight hundred ninety-one million, nine hundred forty-nine thousand, eight hundred thirty-eight".