19138911 has 8 divisors (see below), whose sum is σ = 27838464. Its totient is φ = 11599320.

The previous prime is 19138897. The next prime is 19138919. The reversal of 19138911 is 11983191.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19138911 - 2¹⁴ = 19122527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 579967 = 19138911 / (1 + 9 + 1 + 3 + 8 + 9 + 1 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289951 + ... + 290016.

It is an arithmetic number, because the mean of its divisors is an integer number (3479808).

Almost surely, 2^19138911 is an apocalyptic number.

19138911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19138911 is a deficient number, since it is larger than the sum of its proper divisors (8699553).

19138911 is a wasteful number, since it uses less digits than its factorization.

19138911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579981.

The product of its digits is 1944, while the sum is 33.

The square root of 19138911 is about 4374.8041099002. The cubic root of 19138911 is about 267.4888853215.

The spelling of 19138911 in words is "nineteen million, one hundred thirty-eight thousand, nine hundred eleven".