420696509 has 8 divisors (see below), whose sum is σ = 424996440. Its totient is φ = 416404800.

The previous prime is 420696487. The next prime is 420696511. The reversal of 420696509 is 905696024.

It can be written as a sum of positive squares in 4 ways, for example, as 27269284 + 393427225 = 5222^2 + 19835^2 .

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 420696509 - 2²⁰ = 419647933 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 (420696709) 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, 175499 + ... + 177879.

It is an arithmetic number, because the mean of its divisors is an integer number (53124555).

Almost surely, 2^420696509 is an apocalyptic number.

It is an amenable number.

420696509 is a deficient number, since it is larger than the sum of its proper divisors (4299931).

420696509 is a wasteful number, since it uses less digits than its factorization.

420696509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 420696509 is about 20510.8875722139. The cubic root of 420696509 is about 749.3009836669.

The spelling of 420696509 in words is "four hundred twenty million, six hundred ninety-six thousand, five hundred nine".