1881916840 has 32 divisors (see below), whose sum is σ = 4276245960. Its totient is φ = 745312000.

The previous prime is 1881916823. The next prime is 1881916849. The reversal of 1881916840 is 486191881.

It can be written as a sum of positive squares in 4 ways, for example, as 1880263044 + 1653796 = 43362^2 + 1286^2 .

It is a super-2 number, since 2×1881916840² = 7083221985351171200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1881916849) 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, 228871 + ... + 236950.

Almost surely, 2^1881916840 is an apocalyptic number.

1881916840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881916840 is an abundant number, since it is smaller than the sum of its proper divisors (2394329120).

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

1881916840 is a wasteful number, since it uses less digits than its factorization.

1881916840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465933 (or 465929 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 1881916840 is about 43381.0654548733. The cubic root of 1881916840 is about 1234.6204781586.

The spelling of 1881916840 in words is "one billion, eight hundred eighty-one million, nine hundred sixteen thousand, eight hundred forty".