821449458 has 64 divisors (see below), whose sum is σ = 1926144000. Its totient is φ = 258781392.

The previous prime is 821449451. The next prime is 821449483. The reversal of 821449458 is 854944128.

It is a super-4 number, since 4×821449458⁴ (a number of 37 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (821449451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 622123 + ... + 623441.

It is an arithmetic number, because the mean of its divisors is an integer number (30096000).

Almost surely, 2^821449458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821449458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963072000).

821449458 is an abundant number, since it is smaller than the sum of its proper divisors (1104694542).

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

821449458 is a wasteful number, since it uses less digits than its factorization.

821449458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1950 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 821449458 is about 28660.9395868314. The cubic root of 821449458 is about 936.5413329822.

The spelling of 821449458 in words is "eight hundred twenty-one million, four hundred forty-nine thousand, four hundred fifty-eight".