397086749 has 2 divisors, whose sum is σ = 397086750. Its totient is φ = 397086748.

The previous prime is 397086713. The next prime is 397086751. The reversal of 397086749 is 947680793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325802500 + 71284249 = 18050^2 + 8443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397086749 is a prime.

Together with 397086751, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397086749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397086649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198543374 + 198543375.

It is an arithmetic number, because the mean of its divisors is an integer number (198543375).

Almost surely, 2^397086749 is an apocalyptic number.

It is an amenable number.

397086749 is a deficient number, since it is larger than the sum of its proper divisors (1).

397086749 is an equidigital number, since it uses as much as digits as its factorization.

397086749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 397086749 is about 19927.0356300178. The cubic root of 397086749 is about 735.0131880954.

The spelling of 397086749 in words is "three hundred ninety-seven million, eighty-six thousand, seven hundred forty-nine".