17994420 has 96 divisors (see below), whose sum is σ = 57254400. Its totient is φ = 4689792.

The previous prime is 17994419. The next prime is 17994421. The reversal of 17994420 is 2449971.

It is an interprime number because it is at equal distance from previous prime (17994419) and next prime (17994421).

It is a super-2 number, since 2×17994420² = 647598302272800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17994421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25026 + ... + 25734.

It is an arithmetic number, because the mean of its divisors is an integer number (596400).

Almost surely, 2^17994420 is an apocalyptic number.

17994420 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 17994420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28627200).

17994420 is an abundant number, since it is smaller than the sum of its proper divisors (39259980).

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

17994420 is a wasteful number, since it uses less digits than its factorization.

17994420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 17994420 is about 4241.9830268402. The cubic root of 17994420 is about 262.0470556276.

The spelling of 17994420 in words is "seventeen million, nine hundred ninety-four thousand, four hundred twenty".