397785947 has 12 divisors (see below), whose sum is σ = 432677880. Its totient is φ = 365534208.

The previous prime is 397785937. The next prime is 397785967. The reversal of 397785947 is 749587793.

It is not a de Polignac number, because 397785947 - 2¹⁸ = 397523803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397785937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33179 + ... + 43547.

It is an arithmetic number, because the mean of its divisors is an integer number (36056490).

Almost surely, 2^397785947 is an apocalyptic number.

397785947 is a deficient number, since it is larger than the sum of its proper divisors (34891933).

397785947 is a wasteful number, since it uses less digits than its factorization.

397785947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622 (or 10609 counting only the distinct ones).

The product of its digits is 13335840, while the sum is 59.

The square root of 397785947 is about 19944.5718680547. The cubic root of 397785947 is about 735.4443435941. Note that the first 3 decimals are identical.

The spelling of 397785947 in words is "three hundred ninety-seven million, seven hundred eighty-five thousand, nine hundred forty-seven".