397658445 has 16 divisors (see below), whose sum is σ = 637561152. Its totient is φ = 211648640.

The previous prime is 397658423. The next prime is 397658449. The reversal of 397658445 is 544856793.

It is not a de Polignac number, because 397658445 - 2⁶ = 397658381 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397658449) 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 in 15 ways as a sum of consecutive naturals, for example, 19632 + ... + 34361.

It is an arithmetic number, because the mean of its divisors is an integer number (39847572).

Almost surely, 2^397658445 is an apocalyptic number.

It is an amenable number.

397658445 is a deficient number, since it is larger than the sum of its proper divisors (239902707).

397658445 is a wasteful number, since it uses less digits than its factorization.

397658445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54492.

The product of its digits is 3628800, while the sum is 51.

The square root of 397658445 is about 19941.3752033304. The cubic root of 397658445 is about 735.3657580751.

The spelling of 397658445 in words is "three hundred ninety-seven million, six hundred fifty-eight thousand, four hundred forty-five".