17998420 has 48 divisors (see below), whose sum is σ = 43037568. Its totient is φ = 6258560.

The previous prime is 17998417. The next prime is 17998433. The reversal of 17998420 is 2489971.

17998420 = T₂₇₅ + T₂₇₆ + ... + T₅₀₄.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3282 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (896616).

Almost surely, 2^17998420 is an apocalyptic number.

17998420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17998420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21518784).

17998420 is an abundant number, since it is smaller than the sum of its proper divisors (25039148).

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

17998420 is a wasteful number, since it uses less digits than its factorization.

17998420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600 (or 3598 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 17998420 is about 4242.4544782472. The cubic root of 17998420 is about 262.0664711013.

The spelling of 17998420 in words is "seventeen million, nine hundred ninety-eight thousand, four hundred twenty".