19980395 has 4 divisors (see below), whose sum is σ = 23976480. Its totient is φ = 15984312.

The previous prime is 19980379. The next prime is 19980397. The reversal of 19980395 is 59308991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59308991 = 7 ⋅8472713.

It is a cyclic number.

It is not a de Polignac number, because 19980395 - 2⁴ = 19980379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19980397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998035 + ... + 1998044.

It is an arithmetic number, because the mean of its divisors is an integer number (5994120).

Almost surely, 2^19980395 is an apocalyptic number.

19980395 is a deficient number, since it is larger than the sum of its proper divisors (3996085).

19980395 is an equidigital number, since it uses as much as digits as its factorization.

19980395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996084.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 19980395 is about 4469.9435119473. The cubic root of 19980395 is about 271.3530390674.

The spelling of 19980395 in words is "nineteen million, nine hundred eighty thousand, three hundred ninety-five".