397966247 has 8 divisors (see below), whose sum is σ = 465396096. Its totient is φ = 333180792.

The previous prime is 397966237. The next prime is 397966253. The reversal of 397966247 is 742669793.

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

It is not a de Polignac number, because 397966247 - 2⁸ = 397965991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397966207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660773 + ... + 661374.

It is an arithmetic number, because the mean of its divisors is an integer number (58174512).

Almost surely, 2^397966247 is an apocalyptic number.

397966247 is a deficient number, since it is larger than the sum of its proper divisors (67429849).

397966247 is a wasteful number, since it uses less digits than its factorization.

397966247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322197.

The product of its digits is 3429216, while the sum is 53.

The square root of 397966247 is about 19949.0913828174. The cubic root of 397966247 is about 735.5554423622. Note that the first 3 decimals are identical.

The spelling of 397966247 in words is "three hundred ninety-seven million, nine hundred sixty-six thousand, two hundred forty-seven".