396043643 has 4 divisors (see below), whose sum is σ = 399548568. Its totient is φ = 392538720.

The previous prime is 396043621. The next prime is 396043651. The reversal of 396043643 is 346340693.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 396043643 - 2⁶ = 396043579 is a prime.

It is a super-2 number, since 2×396043643² = 313701134321422898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 396043597 and 396043606.

It is not an unprimeable number, because it can be changed into a prime (396043603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752293 + ... + 1752518.

It is an arithmetic number, because the mean of its divisors is an integer number (99887142).

Almost surely, 2^396043643 is an apocalyptic number.

396043643 is a deficient number, since it is larger than the sum of its proper divisors (3504925).

396043643 is a wasteful number, since it uses less digits than its factorization.

396043643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504924.

The product of its (nonzero) digits is 139968, while the sum is 38.

The square root of 396043643 is about 19900.8452835552. The cubic root of 396043643 is about 734.3690223941.

The spelling of 396043643 in words is "three hundred ninety-six million, forty-three thousand, six hundred forty-three".