1881261900 has 324 divisors, whose sum is σ = 7100795520. Its totient is φ = 414892800.

The previous prime is 1881261887. The next prime is 1881261901. The reversal of 1881261900 is 91621881.

It is a super-2 number, since 2×1881261900² = 7078292672783220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1881261901) 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 107 ways as a sum of consecutive naturals, for example, 1278165 + ... + 1279635.

Almost surely, 2^1881261900 is an apocalyptic number.

1881261900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881261900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3550397760).

1881261900 is an abundant number, since it is smaller than the sum of its proper divisors (5219533620).

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

1881261900 is a wasteful number, since it uses less digits than its factorization.

1881261900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1881261900 is about 43373.5161129462. The cubic root of 1881261900 is about 1234.4772383619.

The spelling of 1881261900 in words is "one billion, eight hundred eighty-one million, two hundred sixty-one thousand, nine hundred".