19426447 has 2 divisors, whose sum is σ = 19426448. Its totient is φ = 19426446.

The previous prime is 19426439. The next prime is 19426453. The reversal of 19426447 is 74462491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19426447 - 2³ = 19426439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19426457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9713223 + 9713224.

It is an arithmetic number, because the mean of its divisors is an integer number (9713224).

Almost surely, 2^19426447 is an apocalyptic number.

19426447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19426447 is an equidigital number, since it uses as much as digits as its factorization.

19426447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 19426447 is about 4407.5443276273. The cubic root of 19426447 is about 268.8217841776.

The spelling of 19426447 in words is "nineteen million, four hundred twenty-six thousand, four hundred forty-seven".