396820394 has 4 divisors (see below), whose sum is σ = 595230594. Its totient is φ = 198410196.

The previous prime is 396820387. The next prime is 396820399. The reversal of 396820394 is 493028693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493028693 = 223 ⋅2210891.

It can be written as a sum of positive squares in only one way, i.e., 325333369 + 71487025 = 18037^2 + 8455^2 .

It is not an unprimeable number, because it can be changed into a prime (396820399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99205097 + ... + 99205100.

Almost surely, 2^396820394 is an apocalyptic number.

396820394 is a deficient number, since it is larger than the sum of its proper divisors (198410200).

396820394 is a wasteful number, since it uses less digits than its factorization.

396820394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198410199.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 396820394 is about 19920.3512519232. The cubic root of 396820394 is about 734.8488090456.

The spelling of 396820394 in words is "three hundred ninety-six million, eight hundred twenty thousand, three hundred ninety-four".