396805440040 has 32 divisors (see below), whose sum is σ = 896131269000. Its totient is φ = 158132126464.

The previous prime is 396805440037. The next prime is 396805440049. The reversal of 396805440040 is 40044508693.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 131149725316 + 265655714724 = 362146^2 + 515418^2 .

It is not an unprimeable number, because it can be changed into a prime (396805440049) 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, 18428155 + ... + 18449674.

Almost surely, 2^396805440040 is an apocalyptic number.

It is an amenable number.

396805440040 is an abundant number, since it is smaller than the sum of its proper divisors (499325828960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

396805440040 is a wasteful number, since it uses less digits than its factorization.

396805440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36878109 (or 36878105 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 396805440040 in words is "three hundred ninety-six billion, eight hundred five million, four hundred forty thousand, forty".