821140460 has 48 divisors (see below), whose sum is σ = 2086668864. Its totient is φ = 264972288.

The previous prime is 821140451. The next prime is 821140469. The reversal of 821140460 is 64041128.

It is an interprime number because it is at equal distance from previous prime (821140451) and next prime (821140469).

It is not an unprimeable number, because it can be changed into a prime (821140469) 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 15 ways as a sum of consecutive naturals, for example, 170129 + ... + 174888.

It is an arithmetic number, because the mean of its divisors is an integer number (43472268).

Almost surely, 2^821140460 is an apocalyptic number.

It is an amenable number.

821140460 is an abundant number, since it is smaller than the sum of its proper divisors (1265528404).

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

821140460 is a wasteful number, since it uses less digits than its factorization.

821140460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345050 (or 345048 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 821140460 is about 28655.5485028642. The cubic root of 821140460 is about 936.4238878615.

Adding to 821140460 its reverse (64041128), we get a palindrome (885181588).

The spelling of 821140460 in words is "eight hundred twenty-one million, one hundred forty thousand, four hundred sixty".