406416649 has 4 divisors (see below), whose sum is σ = 407215620. Its totient is φ = 405617680.

The previous prime is 406416611. The next prime is 406416653. The reversal of 406416649 is 946614604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 275726025 + 130690624 = 16605^2 + 11432^2 .

It is a cyclic number.

It is not a de Polignac number, because 406416649 - 2¹⁵ = 406383881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406416449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398722 + ... + 399739.

It is an arithmetic number, because the mean of its divisors is an integer number (101803905).

Almost surely, 2^406416649 is an apocalyptic number.

It is an amenable number.

406416649 is a deficient number, since it is larger than the sum of its proper divisors (798971).

406416649 is an equidigital number, since it uses as much as digits as its factorization.

406416649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798970.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 406416649 is about 20159.7779997697. Note that the first 3 decimals coincide. The cubic root of 406416649 is about 740.7252744384.

The spelling of 406416649 in words is "four hundred six million, four hundred sixteen thousand, six hundred forty-nine".