396203981 has 2 divisors, whose sum is σ = 396203982. Its totient is φ = 396203980.

The previous prime is 396203953. The next prime is 396204001. The reversal of 396203981 is 189302693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273902500 + 122301481 = 16550^2 + 11059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396203981 is a prime.

It is a super-2 number, since 2×396203981² = 313955189120496722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396202981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198101990 + 198101991.

It is an arithmetic number, because the mean of its divisors is an integer number (198101991).

Almost surely, 2^396203981 is an apocalyptic number.

It is an amenable number.

396203981 is a deficient number, since it is larger than the sum of its proper divisors (1).

396203981 is an equidigital number, since it uses as much as digits as its factorization.

396203981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 396203981 is about 19904.8732977630. The cubic root of 396203981 is about 734.4681119566.

The spelling of 396203981 in words is "three hundred ninety-six million, two hundred three thousand, nine hundred eighty-one".