19138397 has 8 divisors (see below), whose sum is σ = 19699680. Its totient is φ = 18582480.

The previous prime is 19138381. The next prime is 19138409. The reversal of 19138397 is 79383191.

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

It is a cyclic number.

It is not a de Polignac number, because 19138397 - 2⁴ = 19138381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138297) 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, 6554 + ... + 9012.

It is an arithmetic number, because the mean of its divisors is an integer number (2462460).

Almost surely, 2^19138397 is an apocalyptic number.

It is an amenable number.

19138397 is a deficient number, since it is larger than the sum of its proper divisors (561283).

19138397 is a wasteful number, since it uses less digits than its factorization.

19138397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

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

The square root of 19138397 is about 4374.7453640183. The cubic root of 19138397 is about 267.4864907144.

The spelling of 19138397 in words is "nineteen million, one hundred thirty-eight thousand, three hundred ninety-seven".