397794517 has 4 divisors (see below), whose sum is σ = 399065740. Its totient is φ = 396523296.

The previous prime is 397794497. The next prime is 397794533. The reversal of 397794517 is 715497793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145588356 + 252206161 = 12066^2 + 15881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397794517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397792517) 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 in 3 ways as a sum of consecutive naturals, for example, 635142 + ... + 635767.

It is an arithmetic number, because the mean of its divisors is an integer number (99766435).

Almost surely, 2^397794517 is an apocalyptic number.

It is an amenable number.

397794517 is a deficient number, since it is larger than the sum of its proper divisors (1271223).

397794517 is a wasteful number, since it uses less digits than its factorization.

397794517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271222.

The product of its digits is 1666980, while the sum is 52.

The square root of 397794517 is about 19944.7867123216. The cubic root of 397794517 is about 735.4496250885.

The spelling of 397794517 in words is "three hundred ninety-seven million, seven hundred ninety-four thousand, five hundred seventeen".