19690913 has 16 divisors (see below), whose sum is σ = 23535360. Its totient is φ = 16262400.

The previous prime is 19690901. The next prime is 19690933. The reversal of 19690913 is 31909691.

It is not a de Polignac number, because 19690913 - 2¹⁰ = 19689889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19690933) 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, 3608 + ... + 7238.

It is an arithmetic number, because the mean of its divisors is an integer number (1470960).

Almost surely, 2^19690913 is an apocalyptic number.

It is an amenable number.

19690913 is a deficient number, since it is larger than the sum of its proper divisors (3844447).

19690913 is a wasteful number, since it uses less digits than its factorization.

19690913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 19690913 is about 4437.4444221872. Note that the first 4 decimals coincide. The cubic root of 19690913 is about 270.0361771369.

The spelling of 19690913 in words is "nineteen million, six hundred ninety thousand, nine hundred thirteen".