420287447 has 4 divisors (see below), whose sum is σ = 445010256. Its totient is φ = 395564640.

The previous prime is 420287437. The next prime is 420287453. The reversal of 420287447 is 744782024.

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 420287447 - 2¹⁴ = 420271063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420287447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420287437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12361379 + ... + 12361412.

It is an arithmetic number, because the mean of its divisors is an integer number (111252564).

Almost surely, 2^420287447 is an apocalyptic number.

420287447 is a deficient number, since it is larger than the sum of its proper divisors (24722809).

420287447 is a wasteful number, since it uses less digits than its factorization.

420287447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24722808.

The product of its (nonzero) digits is 100352, while the sum is 38.

The square root of 420287447 is about 20500.9133211182. The cubic root of 420287447 is about 749.0580453089.

The spelling of 420287447 in words is "four hundred twenty million, two hundred eighty-seven thousand, four hundred forty-seven".