18953519 has 8 divisors (see below), whose sum is σ = 20534640. Its totient is φ = 17493528.

The previous prime is 18953513. The next prime is 18953531. The reversal of 18953519 is 91535981.

It is not a de Polignac number, because 18953519 - 2¹² = 18949423 is a prime.

It is a super-2 number, since 2×18953519² = 718471764966722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18953513) 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, 2117 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (2566830).

Almost surely, 2^18953519 is an apocalyptic number.

18953519 is a deficient number, since it is larger than the sum of its proper divisors (1581121).

18953519 is an frugal number, since it uses more digits than its factorization.

18953519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666 (or 8640 counting only the distinct ones).

The product of its digits is 48600, while the sum is 41.

The square root of 18953519 is about 4353.5639423351. The cubic root of 18953519 is about 266.6223907393.

The spelling of 18953519 in words is "eighteen million, nine hundred fifty-three thousand, five hundred nineteen".