397824789 has 4 divisors (see below), whose sum is σ = 530433056. Its totient is φ = 265216524.

The previous prime is 397824719. The next prime is 397824797. The reversal of 397824789 is 987428793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 397824789 - 2²¹ = 395727637 is a prime.

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 (397824719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66304129 + ... + 66304134.

It is an arithmetic number, because the mean of its divisors is an integer number (132608264).

Almost surely, 2^397824789 is an apocalyptic number.

It is an amenable number.

397824789 is a deficient number, since it is larger than the sum of its proper divisors (132608267).

397824789 is a wasteful number, since it uses less digits than its factorization.

397824789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132608266.

The product of its digits is 6096384, while the sum is 57.

The square root of 397824789 is about 19945.5455929388. The cubic root of 397824789 is about 735.4682804205.

The spelling of 397824789 in words is "three hundred ninety-seven million, eight hundred twenty-four thousand, seven hundred eighty-nine".