19680405 has 8 divisors (see below), whose sum is σ = 31488672. Its totient is φ = 10496208.

The previous prime is 19680389. The next prime is 19680413. The reversal of 19680405 is 50408691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19680405 - 2⁴ = 19680389 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 655999 + ... + 656028.

It is an arithmetic number, because the mean of its divisors is an integer number (3936084).

Almost surely, 2^19680405 is an apocalyptic number.

19680405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19680405 is a deficient number, since it is larger than the sum of its proper divisors (11808267).

19680405 is a wasteful number, since it uses less digits than its factorization.

19680405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312035.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 19680405 is about 4436.2602493542. The cubic root of 19680405 is about 269.9881339092.

It can be divided in two parts, 196 and 80405, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 19680405 in words is "nineteen million, six hundred eighty thousand, four hundred five".