381820237 has 2 divisors, whose sum is σ = 381820238. Its totient is φ = 381820236.

The previous prime is 381820223. The next prime is 381820253. The reversal of 381820237 is 732028183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200675556 + 181144681 = 14166^2 + 13459^2 .

It is an emirp because it is prime and its reverse (732028183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381820237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381820207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190910118 + 190910119.

It is an arithmetic number, because the mean of its divisors is an integer number (190910119).

Almost surely, 2^381820237 is an apocalyptic number.

It is an amenable number.

381820237 is a deficient number, since it is larger than the sum of its proper divisors (1).

381820237 is an equidigital number, since it uses as much as digits as its factorization.

381820237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 381820237 is about 19540.2210069385. The cubic root of 381820237 is about 725.4703167915.

The spelling of 381820237 in words is "three hundred eighty-one million, eight hundred twenty thousand, two hundred thirty-seven".