819121734 has 40 divisors (see below), whose sum is σ = 1874508768. Its totient is φ = 267228720.

The previous prime is 819121729. The next prime is 819121741. The reversal of 819121734 is 437121918.

It is a happy number.

It is a super-2 number, since 2×819121734² = 1341920830222333512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 46177 + ... + 61404.

Almost surely, 2^819121734 is an apocalyptic number.

819121734 is an abundant number, since it is smaller than the sum of its proper divisors (1055387034).

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

819121734 is a wasteful number, since it uses less digits than its factorization.

819121734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107642 (or 107633 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 819121734 is about 28620.3028285866. The cubic root of 819121734 is about 935.6558769494.

The spelling of 819121734 in words is "eight hundred nineteen million, one hundred twenty-one thousand, seven hundred thirty-four".