1921726842 has 32 divisors (see below), whose sum is σ = 4623705600. Its totient is φ = 520166448.

The previous prime is 1921726817. The next prime is 1921726879. The reversal of 1921726842 is 2486271291.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1921726794 and 1921726803.

It is an unprimeable number.

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, 1203292 + ... + 1204887.

It is an arithmetic number, because the mean of its divisors is an integer number (144490800).

Almost surely, 2^1921726842 is an apocalyptic number.

1921726842 is an abundant number, since it is smaller than the sum of its proper divisors (2701978758).

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

1921726842 is a wasteful number, since it uses less digits than its factorization.

1921726842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408210.

The product of its digits is 96768, while the sum is 42.

The square root of 1921726842 is about 43837.5049700596. The cubic root of 1921726842 is about 1243.2655087543.

The spelling of 1921726842 in words is "one billion, nine hundred twenty-one million, seven hundred twenty-six thousand, eight hundred forty-two".