397632989 has 8 divisors (see below), whose sum is σ = 428685600. Its totient is φ = 366646896.

The previous prime is 397632979. The next prime is 397633003. The reversal of 397632989 is 989236793.

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 397632989 - 2⁸ = 397632733 is a prime.

It is a super-3 number, since 3×397632989³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian 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 (397632959) 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, 3839 + ... + 28460.

It is an arithmetic number, because the mean of its divisors is an integer number (53585700).

Almost surely, 2^397632989 is an apocalyptic number.

It is an amenable number.

397632989 is a deficient number, since it is larger than the sum of its proper divisors (31052611).

397632989 is a wasteful number, since it uses less digits than its factorization.

397632989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33259.

The product of its digits is 4408992, while the sum is 56.

The square root of 397632989 is about 19940.7369221902. The cubic root of 397632989 is about 735.3500663256.

The spelling of 397632989 in words is "three hundred ninety-seven million, six hundred thirty-two thousand, nine hundred eighty-nine".