397242 has 24 divisors (see below), whose sum is σ = 891540. Its totient is φ = 127680.

The previous prime is 397237. The next prime is 397253. The reversal of 397242 is 242793.

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 47961 = 591^2 + 219^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142 + ... + 902.

2³⁹⁷²⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445770).

397242 is an abundant number, since it is smaller than the sum of its proper divisors (494298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

397242 is a wasteful number, since it uses less digits than its factorization.

397242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 397242 is about 630.2713701256. The cubic root of 397242 is about 73.5108966213.

Subtracting from 397242 its reverse (242793), we obtain a square (154449 = 393²).

The spelling of 397242 in words is "three hundred ninety-seven thousand, two hundred forty-two".