420389209 has 4 divisors (see below), whose sum is σ = 445118004. Its totient is φ = 395660416.

The previous prime is 420389201. The next prime is 420389213. The reversal of 420389209 is 902983024.

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 128936025 + 291453184 = 11355^2 + 17072^2 .

It is a cyclic number.

It is not a de Polignac number, because 420389209 - 2³ = 420389201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420389201) 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 3 ways as a sum of consecutive naturals, for example, 12364372 + ... + 12364405.

It is an arithmetic number, because the mean of its divisors is an integer number (111279501).

Almost surely, 2^420389209 is an apocalyptic number.

It is an amenable number.

420389209 is a deficient number, since it is larger than the sum of its proper divisors (24728795).

420389209 is a wasteful number, since it uses less digits than its factorization.

420389209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24728794.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 420389209 is about 20503.3950603309. The cubic root of 420389209 is about 749.1184955985.

The spelling of 420389209 in words is "four hundred twenty million, three hundred eighty-nine thousand, two hundred nine".