19796778 has 16 divisors (see below), whose sum is σ = 43992960. Its totient is φ = 6598908.

The previous prime is 19796753. The next prime is 19796807. The reversal of 19796778 is 87769791.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 366607 = 19796778 / (1 + 9 + 7 + 9 + 6 + 7 + 7 + 8).

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, 183250 + ... + 183357.

It is an arithmetic number, because the mean of its divisors is an integer number (2749560).

Almost surely, 2^19796778 is an apocalyptic number.

19796778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19796778 is an abundant number, since it is smaller than the sum of its proper divisors (24196182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19796778 is a wasteful number, since it uses less digits than its factorization.

19796778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366618 (or 366612 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 19796778 is about 4449.3570322014. The cubic root of 19796778 is about 270.5192476877.

The spelling of 19796778 in words is "nineteen million, seven hundred ninety-six thousand, seven hundred seventy-eight".