397378 has 4 divisors (see below), whose sum is σ = 596070. Its totient is φ = 198688.

The previous prime is 397373. The next prime is 397379. The reversal of 397378 is 873793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873793 = 23 ⋅37991.

It can be written as a sum of positive squares in only one way, i.e., 375769 + 21609 = 613^2 + 147^2 .

It is not an unprimeable number, because it can be changed into a prime (397373) by changing a digit.

397378 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99343 + ... + 99346.

2³⁹⁷³⁷⁸ is an apocalyptic number.

397378 is a deficient number, since it is larger than the sum of its proper divisors (198692).

397378 is a wasteful number, since it uses less digits than its factorization.

397378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198691.

The product of its digits is 31752, while the sum is 37.

The square root of 397378 is about 630.3792509276. The cubic root of 397378 is about 73.5192847418.

The spelling of 397378 in words is "three hundred ninety-seven thousand, three hundred seventy-eight".