397669824 has 140 divisors (see below), whose sum is σ = 1208215008. Its totient is φ = 129254400.

The previous prime is 397669819. The next prime is 397669841. The reversal of 397669824 is 428966793.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 211609 + ... + 213479.

Almost surely, 2^397669824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397669824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604107504).

397669824 is an abundant number, since it is smaller than the sum of its proper divisors (810545184).

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

397669824 is a wasteful number, since it uses less digits than its factorization.

397669824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936 (or 1917 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 397669824 is about 19941.6605126053. The cubic root of 397669824 is about 735.3727721742.

The spelling of 397669824 in words is "three hundred ninety-seven million, six hundred sixty-nine thousand, eight hundred twenty-four".