19718145 has 24 divisors (see below), whose sum is σ = 34909056. Its totient is φ = 10291488.

The previous prime is 19718137. The next prime is 19718177. The reversal of 19718145 is 54181791.

It is not a de Polignac number, because 19718145 - 2³ = 19718137 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2547 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1454544).

It is a Proth number, since it is equal to 2407 ⋅ 2¹³ + 1 and 2407 < 2¹³.

Almost surely, 2^19718145 is an apocalyptic number.

19718145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19718145 is a deficient number, since it is larger than the sum of its proper divisors (15190911).

19718145 is a wasteful number, since it uses less digits than its factorization.

19718145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9381 (or 9378 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 19718145 is about 4440.5117948273. The cubic root of 19718145 is about 270.1606040375.

The spelling of 19718145 in words is "nineteen million, seven hundred eighteen thousand, one hundred forty-five".