395989643 has 8 divisors (see below), whose sum is σ = 472236288. Its totient is φ = 324662184.

The previous prime is 395989637. The next prime is 395989661. The reversal of 395989643 is 346989593.

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

It is not a de Polignac number, because 395989643 - 2⁶ = 395989579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (395989663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229621 + ... + 1229942.

It is an arithmetic number, because the mean of its divisors is an integer number (59029536).

Almost surely, 2^395989643 is an apocalyptic number.

395989643 is a deficient number, since it is larger than the sum of its proper divisors (76246645).

395989643 is a wasteful number, since it uses less digits than its factorization.

395989643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459593.

The product of its digits is 6298560, while the sum is 56.

The square root of 395989643 is about 19899.4885110145. The cubic root of 395989643 is about 734.3356441453.

Subtracting from 395989643 its reverse (346989593), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 395989643 in words is "three hundred ninety-five million, nine hundred eighty-nine thousand, six hundred forty-three".