420609687 has 4 divisors (see below), whose sum is σ = 560812920. Its totient is φ = 280406456.

The previous prime is 420609661. The next prime is 420609689. The reversal of 420609687 is 786906024.

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

It is a cyclic number.

It is not a de Polignac number, because 420609687 - 2¹⁹ = 420085399 is a prime.

It is a super-3 number, since 3×420609687³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420609689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70101612 + ... + 70101617.

It is an arithmetic number, because the mean of its divisors is an integer number (140203230).

Almost surely, 2^420609687 is an apocalyptic number.

420609687 is a deficient number, since it is larger than the sum of its proper divisors (140203233).

420609687 is a wasteful number, since it uses less digits than its factorization.

420609687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140203232.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 420609687 is about 20508.7709773160. The cubic root of 420609687 is about 749.2494340070.

The spelling of 420609687 in words is "four hundred twenty million, six hundred nine thousand, six hundred eighty-seven".