18519420 has 48 divisors (see below), whose sum is σ = 52099488. Its totient is φ = 4915200.

The previous prime is 18519407. The next prime is 18519437. The reversal of 18519420 is 2491581.

It is a happy number.

18519420 is nontrivially palindromic in base 9.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14820 + ... + 16020.

It is an arithmetic number, because the mean of its divisors is an integer number (1085406).

Almost surely, 2^18519420 is an apocalyptic number.

18519420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18519420 is an abundant number, since it is smaller than the sum of its proper divisors (33580068).

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

18519420 is a wasteful number, since it uses less digits than its factorization.

18519420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470 (or 1468 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 18519420 is about 4303.4195705276. The cubic root of 18519420 is about 264.5711349630.

The spelling of 18519420 in words is "eighteen million, five hundred nineteen thousand, four hundred twenty".