397528693 has 2 divisors, whose sum is σ = 397528694. Its totient is φ = 397528692.

The previous prime is 397528631. The next prime is 397528699. The reversal of 397528693 is 396825793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324648324 + 72880369 = 18018^2 + 8537^2 .

It is a cyclic number.

It is not a de Polignac number, because 397528693 - 2¹⁷ = 397397621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397528693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397528699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198764346 + 198764347.

It is an arithmetic number, because the mean of its divisors is an integer number (198764347).

Almost surely, 2^397528693 is an apocalyptic number.

It is an amenable number.

397528693 is a deficient number, since it is larger than the sum of its proper divisors (1).

397528693 is an equidigital number, since it uses as much as digits as its factorization.

397528693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 52.

The square root of 397528693 is about 19938.1216015953. The cubic root of 397528693 is about 735.2857685275.

The spelling of 397528693 in words is "three hundred ninety-seven million, five hundred twenty-eight thousand, six hundred ninety-three".