397489989 has 8 divisors (see below), whose sum is σ = 570754912. Its totient is φ = 244609200.

The previous prime is 397489987. The next prime is 397489991. The reversal of 397489989 is 989984793.

It is an interprime number because it is at equal distance from previous prime (397489987) and next prime (397489991).

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

It is not a de Polignac number, because 397489989 - 2¹ = 397489987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397489987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095987 + ... + 5096064.

It is an arithmetic number, because the mean of its divisors is an integer number (71344364).

Almost surely, 2^397489989 is an apocalyptic number.

397489989 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

397489989 is a deficient number, since it is larger than the sum of its proper divisors (173264923).

397489989 is a wasteful number, since it uses less digits than its factorization.

397489989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10192067.

The product of its digits is 35271936, while the sum is 66.

The square root of 397489989 is about 19937.1509750014. The cubic root of 397489989 is about 735.2619049050.

The spelling of 397489989 in words is "three hundred ninety-seven million, four hundred eighty-nine thousand, nine hundred eighty-nine".