406666649 has 8 divisors (see below), whose sum is σ = 421900800. Its totient is φ = 391564800.

The previous prime is 406666619. The next prime is 406666651. The reversal of 406666649 is 946666604.

It is a happy number.

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 406666649 - 2¹⁶ = 406601113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (406666619) 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, 26792 + ... + 39129.

It is an arithmetic number, because the mean of its divisors is an integer number (52737600).

Almost surely, 2^406666649 is an apocalyptic number.

It is an amenable number.

406666649 is a deficient number, since it is larger than the sum of its proper divisors (15234151).

406666649 is a wasteful number, since it uses less digits than its factorization.

406666649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66151.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The square root of 406666649 is about 20165.9775116407. The cubic root of 406666649 is about 740.8771246490.

The spelling of 406666649 in words is "four hundred six million, six hundred sixty-six thousand, six hundred forty-nine".