3997381 has 2 divisors, whose sum is σ = 3997382. Its totient is φ = 3997380.

The previous prime is 3997361. The next prime is 3997403. The reversal of 3997381 is 1837993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3648100 + 349281 = 1910^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 3997381 - 2⁵ = 3997349 is a prime.

It is a super-2 number, since 2×3997381² = 31958109718322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3997361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998690 + 1998691.

It is an arithmetic number, because the mean of its divisors is an integer number (1998691).

Almost surely, 2^3997381 is an apocalyptic number.

It is an amenable number.

3997381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997381 is an equidigital number, since it uses as much as digits as its factorization.

3997381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 3997381 is about 1999.3451427905. The cubic root of 3997381 is about 158.7054526048.

The spelling of 3997381 in words is "three million, nine hundred ninety-seven thousand, three hundred eighty-one".