394197643 has 16 divisors (see below), whose sum is σ = 470292480. Its totient is φ = 323294400.

The previous prime is 394197637. The next prime is 394197653. The reversal of 394197643 is 346791493.

It is a cyclic number.

It is not a de Polignac number, because 394197643 - 2⁵ = 394197611 is a prime.

It is a super-4 number, since 4×394197643⁴ (a number of 35 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 394197593 and 394197602.

It is not an unprimeable number, because it can be changed into a prime (394197653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9108 + ... + 29518.

It is an arithmetic number, because the mean of its divisors is an integer number (29393280).

Almost surely, 2^394197643 is an apocalyptic number.

394197643 is a deficient number, since it is larger than the sum of its proper divisors (76094837).

394197643 is a wasteful number, since it uses less digits than its factorization.

394197643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20538.

The product of its digits is 489888, while the sum is 46.

The square root of 394197643 is about 19854.4111723315. The cubic root of 394197643 is about 733.2262552794.

The spelling of 394197643 in words is "three hundred ninety-four million, one hundred ninety-seven thousand, six hundred forty-three".