19691423 has 8 divisors (see below), whose sum is σ = 20928528. Its totient is φ = 18463104.

The previous prime is 19691407. The next prime is 19691431. The reversal of 19691423 is 32419691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19691423 - 2⁴ = 19691407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2765 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (2616066).

Almost surely, 2^19691423 is an apocalyptic number.

19691423 is a deficient number, since it is larger than the sum of its proper divisors (1237105).

19691423 is a wasteful number, since it uses less digits than its factorization.

19691423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393.

The product of its digits is 11664, while the sum is 35.

The square root of 19691423 is about 4437.5018873235. The cubic root of 19691423 is about 270.0385084536.

It can be divided in two parts, 196 and 91423, that added together give a palindrome (91619).

The spelling of 19691423 in words is "nineteen million, six hundred ninety-one thousand, four hundred twenty-three".