19426091 has 4 divisors (see below), whose sum is σ = 19468512. Its totient is φ = 19383672.

The previous prime is 19426061. The next prime is 19426111. The reversal of 19426091 is 19062491.

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

It is a cyclic number.

It is not a de Polignac number, because 19426091 - 2¹⁴ = 19409707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19426031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20516 + ... + 21441.

It is an arithmetic number, because the mean of its divisors is an integer number (4867128).

Almost surely, 2^19426091 is an apocalyptic number.

19426091 is a deficient number, since it is larger than the sum of its proper divisors (42421).

19426091 is an equidigital number, since it uses as much as digits as its factorization.

19426091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42420.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 19426091 is about 4407.5039421423. The cubic root of 19426091 is about 268.8201420667.

The spelling of 19426091 in words is "nineteen million, four hundred twenty-six thousand, ninety-one".