1881216490 has 16 divisors (see below), whose sum is σ = 3386803752. Its totient is φ = 752350144.

The previous prime is 1881216473. The next prime is 1881216509. The reversal of 1881216490 is 946121881.

It can be written as a sum of positive squares in 4 ways, for example, as 1645194721 + 236021769 = 40561^2 + 15363^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55572 + ... + 82768.

Almost surely, 2^1881216490 is an apocalyptic number.

1881216490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1881216490 is a deficient number, since it is larger than the sum of its proper divisors (1505587262).

1881216490 is a wasteful number, since it uses less digits than its factorization.

1881216490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34121.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 1881216490 is about 43372.9926336655. The cubic root of 1881216490 is about 1234.4673056562.

The spelling of 1881216490 in words is "one billion, eight hundred eighty-one million, two hundred sixteen thousand, four hundred ninety".