397452521 has 4 divisors (see below), whose sum is σ = 397611600. Its totient is φ = 397293444.

The previous prime is 397452499. The next prime is 397452529. The reversal of 397452521 is 125254793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125254793 = 17 ⋅7367929.

It is a cyclic number.

It is not a de Polignac number, because 397452521 - 2¹⁰ = 397451497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397452529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75731 + ... + 80808.

It is an arithmetic number, because the mean of its divisors is an integer number (99402900).

Almost surely, 2^397452521 is an apocalyptic number.

It is an amenable number.

397452521 is a deficient number, since it is larger than the sum of its proper divisors (159079).

397452521 is a wasteful number, since it uses less digits than its factorization.

397452521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159078.

The product of its digits is 75600, while the sum is 38.

The square root of 397452521 is about 19936.2113000439. The cubic root of 397452521 is about 735.2388018840.

The spelling of 397452521 in words is "three hundred ninety-seven million, four hundred fifty-two thousand, five hundred twenty-one".