1943381 has 6 divisors (see below), whose sum is σ = 2136246. Its totient is φ = 1766600.

The previous prime is 1943371. The next prime is 1943387. The reversal of 1943381 is 1833491.

It can be written as a sum of positive squares in only one way, i.e., 1069156 + 874225 = 1034^2 + 935^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1943381 is a prime.

It is a super-2 number, since 2×1943381² = 7553459422322, 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 (1943387) 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 5 ways as a sum of consecutive naturals, for example, 7910 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (356041).

2^1943381 is an apocalyptic number.

1943381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1943381 is a deficient number, since it is larger than the sum of its proper divisors (192865).

1943381 is a wasteful number, since it uses less digits than its factorization.

1943381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16083 (or 16072 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 1943381 is about 1394.0520076382. The cubic root of 1943381 is about 124.7917813525.

The spelling of 1943381 in words is "one million, nine hundred forty-three thousand, three hundred eighty-one".