666429 has 8 divisors (see below), whose sum is σ = 893952. Its totient is φ = 441600.

The previous prime is 666427. The next prime is 666431. The reversal of 666429 is 924666.

It is an interprime number because it is at equal distance from previous prime (666427) and next prime (666431).

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

It is not a de Polignac number, because 666429 - 2¹ = 666427 is a prime.

It is a super-2 number, since 2×666429² = 888255224082, which contains 22 as substring.

666429 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 666429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666427) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (111744).

2⁶⁶⁶⁴²⁹ is an apocalyptic number.

It is an amenable number.

666429 is a deficient number, since it is larger than the sum of its proper divisors (227523).

666429 is a wasteful number, since it uses less digits than its factorization.

666429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347.

The product of its digits is 15552, while the sum is 33.

The square root of 666429 is about 816.3510274386. The cubic root of 666429 is about 87.3476641919.

The spelling of 666429 in words is "six hundred sixty-six thousand, four hundred twenty-nine".