1881720156 has 48 divisors (see below), whose sum is σ = 4438038528. Its totient is φ = 620505600.

The previous prime is 1881720151. The next prime is 1881720223. The reversal of 1881720156 is 6510271881.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881720151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553221 + ... + 556611.

It is an arithmetic number, because the mean of its divisors is an integer number (92459136).

Almost surely, 2^1881720156 is an apocalyptic number.

It is an amenable number.

1881720156 is an abundant number, since it is smaller than the sum of its proper divisors (2556318372).

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

1881720156 is a wasteful number, since it uses less digits than its factorization.

1881720156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882 (or 3880 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 39.

The square root of 1881720156 is about 43378.7984619215. The cubic root of 1881720156 is about 1234.5774655328.

The spelling of 1881720156 in words is "one billion, eight hundred eighty-one million, seven hundred twenty thousand, one hundred fifty-six".