819809454 has 64 divisors (see below), whose sum is σ = 1764322560. Its totient is φ = 253186560.

The previous prime is 819809437. The next prime is 819809461. The reversal of 819809454 is 454908918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1382182 + ... + 1382774.

It is an arithmetic number, because the mean of its divisors is an integer number (27567540).

Almost surely, 2^819809454 is an apocalyptic number.

819809454 is an abundant number, since it is smaller than the sum of its proper divisors (944513106).

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

819809454 is a wasteful number, since it uses less digits than its factorization.

819809454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 819809454 is about 28632.3148557709. The cubic root of 819809454 is about 935.9176570305.

The spelling of 819809454 in words is "eight hundred nineteen million, eight hundred nine thousand, four hundred fifty-four".