19940890 has 16 divisors (see below), whose sum is σ = 35963208. Its totient is φ = 7960896.

The previous prime is 19940873. The next prime is 19940911. The reversal of 19940890 is 9804991.

It can be written as a sum of positive squares in 4 ways, for example, as 15848361 + 4092529 = 3981^2 + 2023^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4504 + ... + 7756.

Almost surely, 2^19940890 is an apocalyptic number.

19940890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19940890 is a deficient number, since it is larger than the sum of its proper divisors (16022318).

19940890 is a wasteful number, since it uses less digits than its factorization.

19940890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19940890 is about 4465.5223658605. The cubic root of 19940890 is about 271.1740824018.

The spelling of 19940890 in words is "nineteen million, nine hundred forty thousand, eight hundred ninety".