19938137 has 4 divisors (see below), whose sum is σ = 20072100. Its totient is φ = 19804176.

The previous prime is 19938133. The next prime is 19938157. The reversal of 19938137 is 73183991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73183991 = 19 ⋅3851789.

It can be written as a sum of positive squares in 2 ways, for example, as 1413721 + 18524416 = 1189^2 + 4304^2 .

It is a cyclic number.

It is not a de Polignac number, because 19938137 - 2² = 19938133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19938094 and 19938103.

It is not an unprimeable number, because it can be changed into a prime (19938133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66758 + ... + 67055.

It is an arithmetic number, because the mean of its divisors is an integer number (5018025).

Almost surely, 2^19938137 is an apocalyptic number.

It is an amenable number.

19938137 is a deficient number, since it is larger than the sum of its proper divisors (133963).

19938137 is a wasteful number, since it uses less digits than its factorization.

19938137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133962.

The product of its digits is 40824, while the sum is 41.

The square root of 19938137 is about 4465.2141046091. The cubic root of 19938137 is about 271.1616025742.

The spelling of 19938137 in words is "nineteen million, nine hundred thirty-eight thousand, one hundred thirty-seven".