1881997924 has 27 divisors (see below), whose sum is σ = 3340776537. Its totient is φ = 927680688.

The previous prime is 1881997921. The next prime is 1881997927. The reversal of 1881997924 is 4297991881.

The square root of 1881997924 is 43382.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1881997921) and next prime (1881997927).

It can be written as a sum of positive squares in only one way, i.e., 1311743524 + 570254400 = 36218^2 + 23880^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881997921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9457177 + ... + 9457375.

Almost surely, 2^1881997924 is an apocalyptic number.

1881997924 is the 43382-nd square number.

It is an amenable number.

1881997924 is a deficient number, since it is larger than the sum of its proper divisors (1458778613).

1881997924 is an equidigital number, since it uses as much as digits as its factorization.

1881997924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 310 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 58.

The cubic root of 1881997924 is about 1234.6382094644.

The spelling of 1881997924 in words is "one billion, eight hundred eighty-one million, nine hundred ninety-seven thousand, nine hundred twenty-four".