1838872561 has 8 divisors (see below), whose sum is σ = 1856167040. Its totient is φ = 1821636432.

The previous prime is 1838872543. The next prime is 1838872579. The reversal of 1838872561 is 1652788381.

It is an interprime number because it is at equal distance from previous prime (1838872543) and next prime (1838872579).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1838872561 - 2¹¹ = 1838870513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1836872561) 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, 50071 + ... + 78643.

It is an arithmetic number, because the mean of its divisors is an integer number (232020880).

Almost surely, 2^1838872561 is an apocalyptic number.

It is an amenable number.

1838872561 is a deficient number, since it is larger than the sum of its proper divisors (17294479).

1838872561 is a wasteful number, since it uses less digits than its factorization.

1838872561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29175.

The product of its digits is 645120, while the sum is 49.

The square root of 1838872561 is about 42882.0773867125. The cubic root of 1838872561 is about 1225.1348036574.

The spelling of 1838872561 in words is "one billion, eight hundred thirty-eight million, eight hundred seventy-two thousand, five hundred sixty-one".