1905843642 has 16 divisors (see below), whose sum is σ = 3883606560. Its totient is φ = 623294672.

The previous prime is 1905843629. The next prime is 1905843647. The reversal of 1905843642 is 2463485091.

It is a junction number, because it is equal to n+sod(n) for n = 1905843594 and 1905843603.

It is not an unprimeable number, because it can be changed into a prime (1905843647) 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, 2996292 + ... + 2996927.

It is an arithmetic number, because the mean of its divisors is an integer number (242725410).

Almost surely, 2^1905843642 is an apocalyptic number.

1905843642 is an abundant number, since it is smaller than the sum of its proper divisors (1977762918).

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

1905843642 is a wasteful number, since it uses less digits than its factorization.

1905843642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5993277.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1905843642 is about 43655.9691451238. The cubic root of 1905843642 is about 1239.8308046115.

The spelling of 1905843642 in words is "one billion, nine hundred five million, eight hundred forty-three thousand, six hundred forty-two".