420340409 has 8 divisors (see below), whose sum is σ = 425069568. Its totient is φ = 415633680.

The previous prime is 420340397. The next prime is 420340423. The reversal of 420340409 is 904043024.

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 420340409 - 2²⁸ = 151904953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420343409) 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, 33599 + ... + 44379.

It is an arithmetic number, because the mean of its divisors is an integer number (53133696).

Almost surely, 2^420340409 is an apocalyptic number.

It is an amenable number.

420340409 is a deficient number, since it is larger than the sum of its proper divisors (4729159).

420340409 is a wasteful number, since it uses less digits than its factorization.

420340409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11215.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 420340409 is about 20502.2049789773. The cubic root of 420340409 is about 749.0895078601.

The spelling of 420340409 in words is "four hundred twenty million, three hundred forty thousand, four hundred nine".