421640006 has 16 divisors (see below), whose sum is σ = 640569600. Its totient is φ = 208133640.

The previous prime is 421640003. The next prime is 421640033. The reversal of 421640006 is 600046124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421640003) 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, 48095 + ... + 56181.

It is an arithmetic number, because the mean of its divisors is an integer number (40035600).

Almost surely, 2^421640006 is an apocalyptic number.

421640006 is a deficient number, since it is larger than the sum of its proper divisors (218929594).

421640006 is a wasteful number, since it uses less digits than its factorization.

421640006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8419.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 421640006 is about 20533.8745978444. The cubic root of 421640006 is about 749.8607184321.

The spelling of 421640006 in words is "four hundred twenty-one million, six hundred forty thousand, six".