397817493 has 16 divisors (see below), whose sum is σ = 562406976. Its totient is φ = 249263360.

The previous prime is 397817419. The next prime is 397817507. The reversal of 397817493 is 394718793.

It is a cyclic number.

It is not a de Polignac number, because 397817493 - 2⁹ = 397816981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397817293) 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, 34378 + ... + 44468.

It is an arithmetic number, because the mean of its divisors is an integer number (35150436).

Almost surely, 2^397817493 is an apocalyptic number.

It is an amenable number.

397817493 is a deficient number, since it is larger than the sum of its proper divisors (164589483).

397817493 is a wasteful number, since it uses less digits than its factorization.

397817493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884.

The product of its digits is 1143072, while the sum is 51.

The square root of 397817493 is about 19945.3626941202. The cubic root of 397817493 is about 735.4637842960.

It can be divided in two parts, 39781 and 7493, that added together give a palindrome (47274).

The spelling of 397817493 in words is "three hundred ninety-seven million, eight hundred seventeen thousand, four hundred ninety-three".