19764890 has 16 divisors (see below), whose sum is σ = 35737632. Its totient is φ = 7870224.

The previous prime is 19764869. The next prime is 19764893. The reversal of 19764890 is 9846791.

It is not an unprimeable number, because it can be changed into a prime (19764893) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2084 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (2233602).

Almost surely, 2^19764890 is an apocalyptic number.

19764890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19764890 is a deficient number, since it is larger than the sum of its proper divisors (15972742).

19764890 is a wasteful number, since it uses less digits than its factorization.

19764890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8941.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 19764890 is about 4445.7721489073. The cubic root of 19764890 is about 270.3739217903.

The spelling of 19764890 in words is "nineteen million, seven hundred sixty-four thousand, eight hundred ninety".