397748069 has 4 divisors (see below), whose sum is σ = 398483820. Its totient is φ = 397012320.

The previous prime is 397748059. The next prime is 397748077. The reversal of 397748069 is 960847793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960847793 = 23 ⋅41775991.

It can be written as a sum of positive squares in 2 ways, for example, as 143760100 + 253987969 = 11990^2 + 15937^2 .

It is a cyclic number.

It is not a de Polignac number, because 397748069 - 2²⁴ = 380970853 is a prime.

It is a super-2 number, since 2×397748069² = 316407052786457522, which contains 22 as substring.

It is a Duffinian number.

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 397748069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397748059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367064 + ... + 368145.

It is an arithmetic number, because the mean of its divisors is an integer number (99620955).

Almost surely, 2^397748069 is an apocalyptic number.

It is an amenable number.

397748069 is a deficient number, since it is larger than the sum of its proper divisors (735751).

397748069 is an equidigital number, since it uses as much as digits as its factorization.

397748069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735750.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 397748069 is about 19943.6222637714. The cubic root of 397748069 is about 735.4209993430.

The spelling of 397748069 in words is "three hundred ninety-seven million, seven hundred forty-eight thousand, sixty-nine".