19040691 has 4 divisors (see below), whose sum is σ = 25387592. Its totient is φ = 12693792.

The previous prime is 19040689. The next prime is 19040737. The reversal of 19040691 is 19604091.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19040691 - 2¹ = 19040689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19040611) 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 3 ways as a sum of consecutive naturals, for example, 3173446 + ... + 3173451.

It is an arithmetic number, because the mean of its divisors is an integer number (6346898).

Almost surely, 2^19040691 is an apocalyptic number.

19040691 is a deficient number, since it is larger than the sum of its proper divisors (6346901).

19040691 is an equidigital number, since it uses as much as digits as its factorization.

19040691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6346900.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 19040691 is about 4363.5640249686. The cubic root of 19040691 is about 267.0305201544.

The spelling of 19040691 in words is "nineteen million, forty thousand, six hundred ninety-one".