421723506 has 16 divisors (see below), whose sum is σ = 887839200. Its totient is φ = 133175808.

The previous prime is 421723501. The next prime is 421723513. The reversal of 421723506 is 605327124.

It is a super-4 number, since 4×421723506⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (421723501) 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, 1849551 + ... + 1849778.

It is an arithmetic number, because the mean of its divisors is an integer number (55489950).

Almost surely, 2^421723506 is an apocalyptic number.

421723506 is an abundant number, since it is smaller than the sum of its proper divisors (466115694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421723506 is a wasteful number, since it uses less digits than its factorization.

421723506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699353.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 421723506 is about 20535.9077228157. The cubic root of 421723506 is about 749.9102150298.

The spelling of 421723506 in words is "four hundred twenty-one million, seven hundred twenty-three thousand, five hundred six".