397024981 has 2 divisors, whose sum is σ = 397024982. Its totient is φ = 397024980.

The previous prime is 397024949. The next prime is 397025003. The reversal of 397024981 is 189420793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383768100 + 13256881 = 19590^2 + 3641^2 .

It is an emirp because it is prime and its reverse (189420793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397024981 - 2⁵ = 397024949 is a prime.

It is a super-2 number, since 2×397024981² = 315257671076100722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397054981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198512490 + 198512491.

It is an arithmetic number, because the mean of its divisors is an integer number (198512491).

Almost surely, 2^397024981 is an apocalyptic number.

It is an amenable number.

397024981 is a deficient number, since it is larger than the sum of its proper divisors (1).

397024981 is an equidigital number, since it uses as much as digits as its factorization.

397024981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 397024981 is about 19925.4857155353. The cubic root of 397024981 is about 734.9750749719.

The spelling of 397024981 in words is "three hundred ninety-seven million, twenty-four thousand, nine hundred eighty-one".