396861409 has 8 divisors (see below), whose sum is σ = 453919680. Its totient is φ = 339894096.

The previous prime is 396861407. The next prime is 396861449. The reversal of 396861409 is 904168693.

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

It is a cyclic number.

It is not a de Polignac number, because 396861409 - 2¹ = 396861407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396861407) 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, 13114 + ... + 31075.

It is an arithmetic number, because the mean of its divisors is an integer number (56739960).

Almost surely, 2^396861409 is an apocalyptic number.

It is an amenable number.

396861409 is a deficient number, since it is larger than the sum of its proper divisors (57058271).

396861409 is a wasteful number, since it uses less digits than its factorization.

396861409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45479.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 396861409 is about 19921.3807001422. The cubic root of 396861409 is about 734.8741259447.

The spelling of 396861409 in words is "three hundred ninety-six million, eight hundred sixty-one thousand, four hundred nine".