397478993 has 8 divisors (see below), whose sum is σ = 431896320. Its totient is φ = 364411440.

The previous prime is 397478981. The next prime is 397479011. The reversal of 397478993 is 399874793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397478993 - 2⁸ = 397478737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397478293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336830 + ... + 338007.

It is an arithmetic number, because the mean of its divisors is an integer number (53987040).

Almost surely, 2^397478993 is an apocalyptic number.

It is an amenable number.

397478993 is a deficient number, since it is larger than the sum of its proper divisors (34417327).

397478993 is a wasteful number, since it uses less digits than its factorization.

397478993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674887.

The product of its digits is 10287648, while the sum is 59.

The square root of 397478993 is about 19936.8752065112. The cubic root of 397478993 is about 735.2551248479.

The spelling of 397478993 in words is "three hundred ninety-seven million, four hundred seventy-eight thousand, nine hundred ninety-three".