820999454 has 16 divisors (see below), whose sum is σ = 1389780720. Its totient is φ = 360312960.

The previous prime is 820999451. The next prime is 820999463. The reversal of 820999454 is 454999028.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820999451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642779 + ... + 644054.

It is an arithmetic number, because the mean of its divisors is an integer number (86861295).

Almost surely, 2^820999454 is an apocalyptic number.

820999454 is a deficient number, since it is larger than the sum of its proper divisors (568781266).

820999454 is a wasteful number, since it uses less digits than its factorization.

820999454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286875.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 820999454 is about 28653.0880360215. The cubic root of 820999454 is about 936.3702839809.

The spelling of 820999454 in words is "eight hundred twenty million, nine hundred ninety-nine thousand, four hundred fifty-four".