813834021890 has 32 divisors (see below), whose sum is σ = 1500723334656. Its totient is φ = 317574125440.

The previous prime is 813834021883. The next prime is 813834021961. The reversal of 813834021890 is 98120438318.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7805039 + ... + 7908621.

It is an arithmetic number, because the mean of its divisors is an integer number (46897604208).

Almost surely, 2^813834021890 is an apocalyptic number.

813834021890 is a deficient number, since it is larger than the sum of its proper divisors (686889312766).

813834021890 is a wasteful number, since it uses less digits than its factorization.

813834021890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122794.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 813834021890 in words is "eight hundred thirteen billion, eight hundred thirty-four million, twenty-one thousand, eight hundred ninety".