396531709 has 8 divisors (see below), whose sum is σ = 453918528. Its totient is φ = 339329760.

The previous prime is 396531697. The next prime is 396531713. The reversal of 396531709 is 907135693.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 396531709 - 2⁵ = 396531677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396031709) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41587 + ... + 50224.

It is an arithmetic number, because the mean of its divisors is an integer number (56739816).

Almost surely, 2^396531709 is an apocalyptic number.

It is an amenable number.

396531709 is a deficient number, since it is larger than the sum of its proper divisors (57386819).

396531709 is an equidigital number, since it uses as much as digits as its factorization.

396531709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92435.

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 396531709 is about 19913.1039519207. The cubic root of 396531709 is about 734.6705661125.

The spelling of 396531709 in words is "three hundred ninety-six million, five hundred thirty-one thousand, seven hundred nine".