406849821 has 8 divisors (see below), whose sum is σ = 619961664. Its totient is φ = 232485600.

The previous prime is 406849811. The next prime is 406849837. The reversal of 406849821 is 128948604.

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

It is not a de Polignac number, because 406849821 - 2⁶ = 406849757 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406849811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9686880 + ... + 9686921.

It is an arithmetic number, because the mean of its divisors is an integer number (77495208).

Almost surely, 2^406849821 is an apocalyptic number.

It is an amenable number.

406849821 is a deficient number, since it is larger than the sum of its proper divisors (213111843).

406849821 is a wasteful number, since it uses less digits than its factorization.

406849821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19373811.

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 406849821 is about 20170.5186100903. The cubic root of 406849821 is about 740.9883439772.

It can be divided in two parts, 40684 and 9821, that added together give a palindrome (50505).

The spelling of 406849821 in words is "four hundred six million, eight hundred forty-nine thousand, eight hundred twenty-one".