420421309 has 8 divisors (see below), whose sum is σ = 524161728. Its totient is φ = 327600960.

The previous prime is 420421283. The next prime is 420421319. The reversal of 420421309 is 903124024.

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 420421309 - 2¹³ = 420413117 is a prime.

It is a super-2 number, since 2×420421309² = 353508154122546962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420421319) 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 7 ways as a sum of consecutive naturals, for example, 2729932 + ... + 2730085.

It is an arithmetic number, because the mean of its divisors is an integer number (65520216).

Almost surely, 2^420421309 is an apocalyptic number.

It is an amenable number.

420421309 is a deficient number, since it is larger than the sum of its proper divisors (103740419).

420421309 is a wasteful number, since it uses less digits than its factorization.

420421309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460035.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 420421309 is about 20504.1778425764. The cubic root of 420421309 is about 749.1375621295.

The spelling of 420421309 in words is "four hundred twenty million, four hundred twenty-one thousand, three hundred nine".