19004381 has 6 divisors (see below), whose sum is σ = 20889246. Its totient is φ = 17276600.

The previous prime is 19004353. The next prime is 19004399. The reversal of 19004381 is 18340091.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 1069156 = 4235^2 + 1034^2 .

It is not a de Polignac number, because 19004381 - 2¹⁰ = 19003357 is a prime.

It is a super-2 number, since 2×19004381² = 722332994386322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19004381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19004281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78410 + ... + 78651.

It is an arithmetic number, because the mean of its divisors is an integer number (3481541).

Almost surely, 2^19004381 is an apocalyptic number.

19004381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19004381 is a deficient number, since it is larger than the sum of its proper divisors (1884865).

19004381 is a wasteful number, since it uses less digits than its factorization.

19004381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157083 (or 157072 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 19004381 is about 4359.4014497405. The cubic root of 19004381 is about 266.8606725375.

The spelling of 19004381 in words is "nineteen million, four thousand, three hundred eighty-one".