821242854 has 16 divisors (see below), whose sum is σ = 1824984240. Its totient is φ = 273747600.

The previous prime is 821242831. The next prime is 821242859. The reversal of 821242854 is 458242128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821242859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7604047 + ... + 7604154.

It is an arithmetic number, because the mean of its divisors is an integer number (114061515).

Almost surely, 2^821242854 is an apocalyptic number.

821242854 is an abundant number, since it is smaller than the sum of its proper divisors (1003741386).

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

821242854 is a wasteful number, since it uses less digits than its factorization.

821242854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15208212 (or 15208206 counting only the distinct ones).

The product of its digits is 40960, while the sum is 36.

The square root of 821242854 is about 28657.3350819646. The cubic root of 821242854 is about 936.4628094213.

The spelling of 821242854 in words is "eight hundred twenty-one million, two hundred forty-two thousand, eight hundred fifty-four".