19846945 has 4 divisors (see below), whose sum is σ = 23816340. Its totient is φ = 15877552.

The previous prime is 19846921. The next prime is 19846969. The reversal of 19846945 is 54964891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19846921) and next prime (19846969).

It can be written as a sum of positive squares in 2 ways, for example, as 11826721 + 8020224 = 3439^2 + 2832^2 .

It is a cyclic number.

It is not a de Polignac number, because 19846945 - 2¹¹ = 19844897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19846895 and 19846904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984690 + ... + 1984699.

It is an arithmetic number, because the mean of its divisors is an integer number (5954085).

Almost surely, 2^19846945 is an apocalyptic number.

It is an amenable number.

19846945 is a deficient number, since it is larger than the sum of its proper divisors (3969395).

19846945 is an equidigital number, since it uses as much as digits as its factorization.

19846945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969394.

The product of its digits is 311040, while the sum is 46.

The square root of 19846945 is about 4454.9910213153. The cubic root of 19846945 is about 270.7475624783.

The spelling of 19846945 in words is "nineteen million, eight hundred forty-six thousand, nine hundred forty-five".