396405438 has 96 divisors (see below), whose sum is σ = 950335008. Its totient is φ = 109486080.

The previous prime is 396405431. The next prime is 396405467. The reversal of 396405438 is 834504693.

It is a self number, because there is not a number n which added to its sum of digits gives 396405438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396405431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 915270 + ... + 915702.

It is an arithmetic number, because the mean of its divisors is an integer number (9899323).

Almost surely, 2^396405438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 396405438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475167504).

396405438 is an abundant number, since it is smaller than the sum of its proper divisors (553929570).

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

396405438 is a wasteful number, since it uses less digits than its factorization.

396405438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 396405438 is about 19909.9331490590. The cubic root of 396405438 is about 734.5925753461.

The spelling of 396405438 in words is "three hundred ninety-six million, four hundred five thousand, four hundred thirty-eight".