1881916838 has 4 divisors (see below), whose sum is σ = 2822875260. Its totient is φ = 940958418.

The previous prime is 1881916823. The next prime is 1881916849. The reversal of 1881916838 is 8386191881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8386191881 = 67 ⋅125167043.

It is a super-2 number, since 2×1881916838² = 7083221970295836488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1881916838.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470479208 + ... + 470479211.

It is an arithmetic number, because the mean of its divisors is an integer number (705718815).

Almost surely, 2^1881916838 is an apocalyptic number.

1881916838 is a deficient number, since it is larger than the sum of its proper divisors (940958422).

1881916838 is an equidigital number, since it uses as much as digits as its factorization.

1881916838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940958421.

The product of its digits is 663552, while the sum is 53.

The square root of 1881916838 is about 43381.0654318218. The cubic root of 1881916838 is about 1234.6204777212.

The spelling of 1881916838 in words is "one billion, eight hundred eighty-one million, nine hundred sixteen thousand, eight hundred thirty-eight".