396746643 has 8 divisors (see below), whose sum is σ = 529158400. Its totient is φ = 264416328.

The previous prime is 396746617. The next prime is 396746699. The reversal of 396746643 is 346647693.

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

It is not a de Polignac number, because 396746643 - 2⁶ = 396746579 is a prime.

It is a super-4 number, since 4×396746643⁴ (a number of 35 digits) contains 4444 as substring.

It is the 19919-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 396746592 and 396746601.

It is not an unprimeable number, because it can be changed into a prime (396746143) by changing a digit.

It is a nontrivial repunit in base 19918.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7903 + ... + 29256.

It is an arithmetic number, because the mean of its divisors is an integer number (66144800).

Almost surely, 2^396746643 is an apocalyptic number.

396746643 is a deficient number, since it is larger than the sum of its proper divisors (132411757).

396746643 is a wasteful number, since it uses less digits than its factorization.

396746643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40721.

The product of its digits is 1959552, while the sum is 48.

The square root of 396746643 is about 19918.5000188267. The cubic root of 396746643 is about 734.8032811500.

The spelling of 396746643 in words is "three hundred ninety-six million, seven hundred forty-six thousand, six hundred forty-three".