396531945 has 24 divisors (see below), whose sum is σ = 689584896. Its totient is φ = 210787488.

The previous prime is 396531913. The next prime is 396531991. The reversal of 396531945 is 549135693.

It is not a de Polignac number, because 396531945 - 2⁵ = 396531913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 396531945.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 537 + ... + 28166.

It is an arithmetic number, because the mean of its divisors is an integer number (28732704).

Almost surely, 2^396531945 is an apocalyptic number.

It is an amenable number.

396531945 is a deficient number, since it is larger than the sum of its proper divisors (293052951).

396531945 is a wasteful number, since it uses less digits than its factorization.

396531945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29021 (or 29018 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 396531945 is about 19913.1098776660. The cubic root of 396531945 is about 734.6707118615.

The spelling of 396531945 in words is "three hundred ninety-six million, five hundred thirty-one thousand, nine hundred forty-five".