396645745 has 8 divisors (see below), whose sum is σ = 476087400. Its totient is φ = 317241600.

The previous prime is 396645671. The next prime is 396645749. The reversal of 396645745 is 547546693.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 109139809 + 287505936 = 10447^2 + 16956^2 .

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

It is not a de Polignac number, because 396645745 - 2⁷ = 396645617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (396645749) 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, 26095 + ... + 38395.

It is an arithmetic number, because the mean of its divisors is an integer number (59510925).

Almost surely, 2^396645745 is an apocalyptic number.

It is an amenable number.

396645745 is a deficient number, since it is larger than the sum of its proper divisors (79441655).

396645745 is a wasteful number, since it uses less digits than its factorization.

396645745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18755.

The product of its digits is 2721600, while the sum is 49.

The square root of 396645745 is about 19915.9670867372. The cubic root of 396645745 is about 734.7409857544.

The spelling of 396645745 in words is "three hundred ninety-six million, six hundred forty-five thousand, seven hundred forty-five".