421408518 has 16 divisors (see below), whose sum is σ = 843062256. Its totient is φ = 140428640.

The previous prime is 421408517. The next prime is 421408531. The reversal of 421408518 is 815804124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421408511) 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, 18208 + ... + 34268.

It is an arithmetic number, because the mean of its divisors is an integer number (52691391).

Almost surely, 2^421408518 is an apocalyptic number.

421408518 is an abundant number, since it is smaller than the sum of its proper divisors (421653738).

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

421408518 is a wasteful number, since it uses less digits than its factorization.

421408518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20439.

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 421408518 is about 20528.2370894337. The cubic root of 421408518 is about 749.7234642721.

The spelling of 421408518 in words is "four hundred twenty-one million, four hundred eight thousand, five hundred eighteen".