19138835 has 4 divisors (see below), whose sum is σ = 22966608. Its totient is φ = 15311064.

The previous prime is 19138807. The next prime is 19138843. The reversal of 19138835 is 53883191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53883191 = 61 ⋅883331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19138835 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1913879 + ... + 1913888.

It is an arithmetic number, because the mean of its divisors is an integer number (5741652).

Almost surely, 2^19138835 is an apocalyptic number.

19138835 is a deficient number, since it is larger than the sum of its proper divisors (3827773).

19138835 is an equidigital number, since it uses as much as digits as its factorization.

19138835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3827772.

The product of its digits is 25920, while the sum is 38.

The square root of 19138835 is about 4374.7954237884. The cubic root of 19138835 is about 267.4885312578.

The spelling of 19138835 in words is "nineteen million, one hundred thirty-eight thousand, eight hundred thirty-five".