19683945 has 16 divisors (see below), whose sum is σ = 34993920. Its totient is φ = 10498032.

The previous prime is 19683941. The next prime is 19683947. The reversal of 19683945 is 54938691.

It is a happy number.

It is not a de Polignac number, because 19683945 - 2² = 19683941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19683945.

It is not an unprimeable number, because it can be changed into a prime (19683941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72769 + ... + 73038.

It is an arithmetic number, because the mean of its divisors is an integer number (2187120).

Almost surely, 2^19683945 is an apocalyptic number.

19683945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19683945 is a deficient number, since it is larger than the sum of its proper divisors (15309975).

19683945 is a wasteful number, since it uses less digits than its factorization.

19683945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145821 (or 145815 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 19683945 is about 4436.6592161220. The cubic root of 19683945 is about 270.0043209185.

The spelling of 19683945 in words is "nineteen million, six hundred eighty-three thousand, nine hundred forty-five".