11890381 has 2 divisors, whose sum is σ = 11890382. Its totient is φ = 11890380.

The previous prime is 11890363. The next prime is 11890387. The reversal of 11890381 is 18309811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10949481 + 940900 = 3309^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 11890381 - 2⁹ = 11889869 is a prime.

It is a super-2 number, since 2×11890381² = 282762320650322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11890387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945190 + 5945191.

It is an arithmetic number, because the mean of its divisors is an integer number (5945191).

Almost surely, 2^11890381 is an apocalyptic number.

It is an amenable number.

11890381 is a deficient number, since it is larger than the sum of its proper divisors (1).

11890381 is an equidigital number, since it uses as much as digits as its factorization.

11890381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 11890381 is about 3448.2431758796. The cubic root of 11890381 is about 228.2435903326.

The spelling of 11890381 in words is "eleven million, eight hundred ninety thousand, three hundred eighty-one".