396738581 has 2 divisors, whose sum is σ = 396738582. Its totient is φ = 396738580.

The previous prime is 396738533. The next prime is 396738611. The reversal of 396738581 is 185837693.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370216081 + 26522500 = 19241^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 396738581 - 2¹⁴ = 396722197 is a prime.

It is a super-2 number, since 2×396738581² = 314803003307787122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396738481) 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 as a sum of consecutive naturals, namely, 198369290 + 198369291.

It is an arithmetic number, because the mean of its divisors is an integer number (198369291).

Almost surely, 2^396738581 is an apocalyptic number.

It is an amenable number.

396738581 is a deficient number, since it is larger than the sum of its proper divisors (1).

396738581 is an equidigital number, since it uses as much as digits as its factorization.

396738581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 50.

The square root of 396738581 is about 19918.2976431220. The cubic root of 396738581 is about 734.7983039820.

The spelling of 396738581 in words is "three hundred ninety-six million, seven hundred thirty-eight thousand, five hundred eighty-one".