19871345 has 16 divisors (see below), whose sum is σ = 25788672. Its totient is φ = 14612160.

The previous prime is 19871281. The next prime is 19871381. The reversal of 19871345 is 54317891.

It is not a de Polignac number, because 19871345 - 2⁶ = 19871281 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19871299 and 19871308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19724 + ... + 20706.

It is an arithmetic number, because the mean of its divisors is an integer number (1611792).

Almost surely, 2^19871345 is an apocalyptic number.

It is an amenable number.

19871345 is a deficient number, since it is larger than the sum of its proper divisors (5917327).

19871345 is a wasteful number, since it uses less digits than its factorization.

19871345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312.

The product of its digits is 30240, while the sum is 38.

The square root of 19871345 is about 4457.7286817392. The cubic root of 19871345 is about 270.8584701455.

The spelling of 19871345 in words is "nineteen million, eight hundred seventy-one thousand, three hundred forty-five".