420705629 has 4 divisors (see below), whose sum is σ = 421415676. Its totient is φ = 419995584.

The previous prime is 420705617. The next prime is 420705631. The reversal of 420705629 is 926507024.

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 167832025 + 252873604 = 12955^2 + 15902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420705629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420705689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354134 + ... + 355319.

It is an arithmetic number, because the mean of its divisors is an integer number (105353919).

Almost surely, 2^420705629 is an apocalyptic number.

It is an amenable number.

420705629 is a deficient number, since it is larger than the sum of its proper divisors (710047).

420705629 is an equidigital number, since it uses as much as digits as its factorization.

420705629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710046.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 420705629 is about 20511.1098919586. The cubic root of 420705629 is about 749.3063981605.

The spelling of 420705629 in words is "four hundred twenty million, seven hundred five thousand, six hundred twenty-nine".