397907196 has 72 divisors (see below), whose sum is σ = 1011838464. Its totient is φ = 121560480.

The previous prime is 397907143. The next prime is 397907201. The reversal of 397907196 is 691709793.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132811 + ... + 135773.

It is an arithmetic number, because the mean of its divisors is an integer number (14053312).

Almost surely, 2^397907196 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 397907196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505919232).

397907196 is an abundant number, since it is smaller than the sum of its proper divisors (613931268).

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

397907196 is a wasteful number, since it uses less digits than its factorization.

397907196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3039 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 642978, while the sum is 51.

The square root of 397907196 is about 19947.6112855650. The cubic root of 397907196 is about 735.5190595171.

The spelling of 397907196 in words is "three hundred ninety-seven million, nine hundred seven thousand, one hundred ninety-six".