405616646 has 8 divisors (see below), whose sum is σ = 609116664. Its totient is φ = 202577760.

The previous prime is 405616639. The next prime is 405616657. The reversal of 405616646 is 646616504.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113075 + ... + 116606.

It is an arithmetic number, because the mean of its divisors is an integer number (76139583).

Almost surely, 2^405616646 is an apocalyptic number.

405616646 is a deficient number, since it is larger than the sum of its proper divisors (203500018).

405616646 is a wasteful number, since it uses less digits than its factorization.

405616646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230566.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 405616646 is about 20139.9266632230. The cubic root of 405616646 is about 740.2389330708.

It can be divided in two parts, 4056 and 16646, that added together give a palindrome (20702).

The spelling of 405616646 in words is "four hundred five million, six hundred sixteen thousand, six hundred forty-six".