421684998 has 64 divisors (see below), whose sum is σ = 1000581120. Its totient is φ = 115920000.

The previous prime is 421684981. The next prime is 421685003. The reversal of 421684998 is 899486124.

It is a self number, because there is not a number n which added to its sum of digits gives 421684998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561123 + ... + 561873.

It is an arithmetic number, because the mean of its divisors is an integer number (15634080).

Almost surely, 2^421684998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421684998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (500290560).

421684998 is an abundant number, since it is smaller than the sum of its proper divisors (578896122).

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

421684998 is a wasteful number, since it uses less digits than its factorization.

421684998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253.

The product of its digits is 995328, while the sum is 51.

The square root of 421684998 is about 20534.9701241565. The cubic root of 421684998 is about 749.8873893148.

The spelling of 421684998 in words is "four hundred twenty-one million, six hundred eighty-four thousand, nine hundred ninety-eight".