1768381 has 2 divisors, whose sum is σ = 1768382. Its totient is φ = 1768380.

The previous prime is 1768379. The next prime is 1768399. The reversal of 1768381 is 1838671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1136356 + 632025 = 1066^2 + 795^2 .

It is an emirp because it is prime and its reverse (1838671) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1768381 - 2¹ = 1768379 is a prime.

It is a super-2 number, since 2×1768381² = 6254342722322, which contains 22 as substring.

Together with 1768379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1768321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 884190 + 884191.

It is an arithmetic number, because the mean of its divisors is an integer number (884191).

2^1768381 is an apocalyptic number.

It is an amenable number.

1768381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1768381 is an equidigital number, since it uses as much as digits as its factorization.

1768381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 1768381 is about 1329.8048729043. The cubic root of 1768381 is about 120.9275572108.

The spelling of 1768381 in words is "one million, seven hundred sixty-eight thousand, three hundred eighty-one".