19795989 has 16 divisors (see below), whose sum is σ = 27195840. Its totient is φ = 12800640.

The previous prime is 19795987. The next prime is 19796017. The reversal of 19795989 is 98959791.

It is not a de Polignac number, because 19795989 - 2¹ = 19795987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19795987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27567 + ... + 28275.

It is an arithmetic number, because the mean of its divisors is an integer number (1699740).

Almost surely, 2^19795989 is an apocalyptic number.

It is an amenable number.

19795989 is a deficient number, since it is larger than the sum of its proper divisors (7399851).

19795989 is a wasteful number, since it uses less digits than its factorization.

19795989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its digits is 1837080, while the sum is 57.

The square root of 19795989 is about 4449.2683668217. The cubic root of 19795989 is about 270.5156537944.

The spelling of 19795989 in words is "nineteen million, seven hundred ninety-five thousand, nine hundred eighty-nine".