19804137 has 16 divisors (see below), whose sum is σ = 27984960. Its totient is φ = 12422592.

The previous prime is 19804111. The next prime is 19804153. The reversal of 19804137 is 73140891.

It is not a de Polignac number, because 19804137 - 2¹¹ = 19802089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19804098 and 19804107.

It is not an unprimeable number, because it can be changed into a prime (19804157) 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, 7843 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (1749060).

Almost surely, 2^19804137 is an apocalyptic number.

It is an amenable number.

19804137 is a deficient number, since it is larger than the sum of its proper divisors (8180823).

19804137 is a wasteful number, since it uses less digits than its factorization.

19804137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 19804137 is about 4450.1839287832. The cubic root of 19804137 is about 270.5527633187.

The spelling of 19804137 in words is "nineteen million, eight hundred four thousand, one hundred thirty-seven".