421608447 has 12 divisors (see below), whose sum is σ = 655835544. Its totient is φ = 259451280.

The previous prime is 421608433. The next prime is 421608479. The reversal of 421608447 is 744806124.

421608447 is a `hidden beast` number, since 4 + 2 + 1 + 608 + 4 + 47 = 666.

It is not a de Polignac number, because 421608447 - 2⁴ = 421608431 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421608427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1801629 + ... + 1801862.

It is an arithmetic number, because the mean of its divisors is an integer number (54652962).

Almost surely, 2^421608447 is an apocalyptic number.

421608447 is a deficient number, since it is larger than the sum of its proper divisors (234227097).

421608447 is a wasteful number, since it uses less digits than its factorization.

421608447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603510 (or 3603507 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 421608447 is about 20533.1061215784. The cubic root of 421608447 is about 749.8420093876.

The spelling of 421608447 in words is "four hundred twenty-one million, six hundred eight thousand, four hundred forty-seven".