397642 has 8 divisors (see below), whose sum is σ = 681696. Its totient is φ = 170412.

The previous prime is 397633. The next prime is 397643. The reversal of 397642 is 246793.

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

It is not an unprimeable number, because it can be changed into a prime (397643) by changing a digit.

397642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14188 + ... + 14215.

It is an arithmetic number, because the mean of its divisors is an integer number (85212).

2³⁹⁷⁶⁴² is an apocalyptic number.

397642 is a deficient number, since it is larger than the sum of its proper divisors (284054).

397642 is a wasteful number, since it uses less digits than its factorization.

397642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28412.

The product of its digits is 9072, while the sum is 31.

The square root of 397642 is about 630.5886139156. The cubic root of 397642 is about 73.5355621020.

The spelling of 397642 in words is "three hundred ninety-seven thousand, six hundred forty-two".