19490859 has 6 divisors (see below), whose sum is σ = 28153476. Its totient is φ = 12993900.

The previous prime is 19490843. The next prime is 19490873. The reversal of 19490859 is 95809491.

It is not a de Polignac number, because 19490859 - 2⁴ = 19490843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19490819) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1082817 + ... + 1082834.

It is an arithmetic number, because the mean of its divisors is an integer number (4692246).

Almost surely, 2^19490859 is an apocalyptic number.

19490859 is a deficient number, since it is larger than the sum of its proper divisors (8662617).

19490859 is a wasteful number, since it uses less digits than its factorization.

19490859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165657 (or 2165654 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 19490859 is about 4414.8452974028. The cubic root of 19490859 is about 269.1185659569.

The spelling of 19490859 in words is "nineteen million, four hundred ninety thousand, eight hundred fifty-nine".