397143989 has 16 divisors (see below), whose sum is σ = 438789120. Its totient is φ = 356454000.

The previous prime is 397143979. The next prime is 397144039. The reversal of 397143989 is 989341793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 397143989 - 2⁴ = 397143973 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 397143989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397143949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322004 + ... + 323234.

It is an arithmetic number, because the mean of its divisors is an integer number (27424320).

Almost surely, 2^397143989 is an apocalyptic number.

It is an amenable number.

397143989 is a deficient number, since it is larger than the sum of its proper divisors (41645131).

397143989 is a wasteful number, since it uses less digits than its factorization.

397143989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its digits is 1469664, while the sum is 53.

The square root of 397143989 is about 19928.4718179794. The cubic root of 397143989 is about 735.0485037484.

The spelling of 397143989 in words is "three hundred ninety-seven million, one hundred forty-three thousand, nine hundred eighty-nine".