18719953 has 8 divisors (see below), whose sum is σ = 22324608. Its totient is φ = 15347904.

The previous prime is 18719929. The next prime is 18719957. The reversal of 18719953 is 35991781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18719953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18719957) 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, 57976 + ... + 58297.

It is an arithmetic number, because the mean of its divisors is an integer number (2790576).

Almost surely, 2^18719953 is an apocalyptic number.

It is an amenable number.

18719953 is a deficient number, since it is larger than the sum of its proper divisors (3604655).

18719953 is a wasteful number, since it uses less digits than its factorization.

18719953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116303.

The product of its digits is 68040, while the sum is 43.

The square root of 18719953 is about 4326.6560991140. The cubic root of 18719953 is about 265.5226566375.

The spelling of 18719953 in words is "eighteen million, seven hundred nineteen thousand, nine hundred fifty-three".