1933981 has 12 divisors (see below), whose sum is σ = 2329020. Its totient is φ = 1599360.

The previous prime is 1933979. The next prime is 1933993. The reversal of 1933981 is 1893391.

It can be written as a sum of positive squares in 2 ways, for example, as 648025 + 1285956 = 805^2 + 1134^2 .

It is not a de Polignac number, because 1933981 - 2¹ = 1933979 is a prime.

It is a super-2 number, since 2×1933981² = 7480565016722, which contains 22 as substring.

It is a Duffinian number.

1933981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1933931) 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 11 ways as a sum of consecutive naturals, for example, 741 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (194085).

2^1933981 is an apocalyptic number.

It is an amenable number.

1933981 is a deficient number, since it is larger than the sum of its proper divisors (395039).

1933981 is a wasteful number, since it uses less digits than its factorization.

1933981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404 (or 1397 counting only the distinct ones).

The product of its digits is 5832, while the sum is 34.

The square root of 1933981 is about 1390.6764541043. The cubic root of 1933981 is about 124.5902529934.

The spelling of 1933981 in words is "one million, nine hundred thirty-three thousand, nine hundred eighty-one".