396521386 has 4 divisors (see below), whose sum is σ = 594782082. Its totient is φ = 198260692.

The previous prime is 396521371. The next prime is 396521387. The reversal of 396521386 is 683125693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 278255761 + 118265625 = 16681^2 + 10875^2 .

It is not an unprimeable number, because it can be changed into a prime (396521387) by changing a digit.

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 as a sum of consecutive naturals, namely, 99130345 + ... + 99130348.

Almost surely, 2^396521386 is an apocalyptic number.

396521386 is a deficient number, since it is larger than the sum of its proper divisors (198260696).

396521386 is a wasteful number, since it uses less digits than its factorization.

396521386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198260695.

The product of its digits is 233280, while the sum is 43.

The square root of 396521386 is about 19912.8447490558. The cubic root of 396521386 is about 734.6641907753.

The spelling of 396521386 in words is "three hundred ninety-six million, five hundred twenty-one thousand, three hundred eighty-six".