19692138 has 16 divisors (see below), whose sum is σ = 39650400. Its totient is φ = 6519696.

The previous prime is 19692121. The next prime is 19692143. The reversal of 19692138 is 83129691.

It is a super-2 number, since 2×19692138² = 775560598022088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19692096 and 19692105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10120 + ... + 11907.

It is an arithmetic number, because the mean of its divisors is an integer number (2478150).

Almost surely, 2^19692138 is an apocalyptic number.

19692138 is an abundant number, since it is smaller than the sum of its proper divisors (19958262).

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

19692138 is a wasteful number, since it uses less digits than its factorization.

19692138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22181.

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

The square root of 19692138 is about 4437.5824499383. The cubic root of 19692138 is about 270.0417768003.

The spelling of 19692138 in words is "nineteen million, six hundred ninety-two thousand, one hundred thirty-eight".