420665667 has 8 divisors (see below), whose sum is σ = 562803024. Its totient is φ = 279486048.

The previous prime is 420665647. The next prime is 420665669. The reversal of 420665667 is 766566024.

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

It is not a de Polignac number, because 420665667 - 2⁸ = 420665411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420665669) 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 7 ways as a sum of consecutive naturals, for example, 238408 + ... + 240165.

It is an arithmetic number, because the mean of its divisors is an integer number (70350378).

Almost surely, 2^420665667 is an apocalyptic number.

420665667 is a deficient number, since it is larger than the sum of its proper divisors (142137357).

420665667 is a wasteful number, since it uses less digits than its factorization.

420665667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478869.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 420665667 is about 20510.1357138367. The cubic root of 420665667 is about 749.2826723624.

The spelling of 420665667 in words is "four hundred twenty million, six hundred sixty-five thousand, six hundred sixty-seven".