1928981 has 4 divisors (see below), whose sum is σ = 1932000. Its totient is φ = 1925964.

The previous prime is 1928963. The next prime is 1928989. The reversal of 1928981 is 1898291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1898291 = 79 ⋅24029.

It is a cyclic number.

It is not a de Polignac number, because 1928981 - 2¹⁰ = 1927957 is a prime.

It is a super-2 number, since 2×1928981² = 7441935396722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1928989) 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 3 ways as a sum of consecutive naturals, for example, 131 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (483000).

2^1928981 is an apocalyptic number.

It is an amenable number.

1928981 is a deficient number, since it is larger than the sum of its proper divisors (3019).

1928981 is an equidigital number, since it uses as much as digits as its factorization.

1928981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018.

The product of its digits is 10368, while the sum is 38.

The square root of 1928981 is about 1388.8776043986. The cubic root of 1928981 is about 124.4827909097.

The spelling of 1928981 in words is "one million, nine hundred twenty-eight thousand, nine hundred eighty-one".