19691238 has 24 divisors (see below), whose sum is σ = 45812952. Its totient is φ = 5625984.

The previous prime is 19691213. The next prime is 19691251. The reversal of 19691238 is 83219691.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19691196 and 19691205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33195 + ... + 33782.

It is an arithmetic number, because the mean of its divisors is an integer number (1908873).

Almost surely, 2^19691238 is an apocalyptic number.

19691238 is an abundant number, since it is smaller than the sum of its proper divisors (26121714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19691238 is a wasteful number, since it uses less digits than its factorization.

19691238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66996 (or 66989 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 19691238 is about 4437.4810422130. The cubic root of 19691238 is about 270.0376627845.

The spelling of 19691238 in words is "nineteen million, six hundred ninety-one thousand, two hundred thirty-eight".