396197989 has 16 divisors (see below), whose sum is σ = 440757504. Its totient is φ = 353102400.

The previous prime is 396197987. The next prime is 396197993. The reversal of 396197989 is 989791693.

It is a cyclic number.

It is not a de Polignac number, because 396197989 - 2¹ = 396197987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396197987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249492 + ... + 251074.

It is an arithmetic number, because the mean of its divisors is an integer number (27547344).

Almost surely, 2^396197989 is an apocalyptic number.

It is an amenable number.

396197989 is a deficient number, since it is larger than the sum of its proper divisors (44559515).

396197989 is a wasteful number, since it uses less digits than its factorization.

396197989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028.

The product of its digits is 6613488, while the sum is 61.

The square root of 396197989 is about 19904.7227812899. The cubic root of 396197989 is about 734.4644093561.

The spelling of 396197989 in words is "three hundred ninety-six million, one hundred ninety-seven thousand, nine hundred eighty-nine".