19394429 has 2 divisors, whose sum is σ = 19394430.
Its totient is φ = 19394428.
The previous prime is 19394413. The next prime is 19394477. The reversal of 19394429 is 92449391.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 11042329 + 8352100 = 3323^2 + 2890^2
It is a cyclic number.
It is not a de Polignac number, because 19394429 - 24 = 19394413 is a prime.
It is a super-2 number, since 2×193944292 = 752287752472082, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (19394489) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9697214 + 9697215.
It is an arithmetic number, because the mean of its divisors is an integer number (9697215).
Almost surely, 219394429 is an apocalyptic number.
It is an amenable number.
19394429 is a deficient number, since it is larger than the sum of its proper divisors (1).
19394429 is an equidigital number, since it uses as much as digits as its factorization.
19394429 is an evil number, because the sum of its binary digits is even.
The product of its digits is 69984, while the sum is 41.
The square root of 19394429 is about 4403.9106485032.
The cubic root of 19394429 is about 268.6740153674.
The spelling of 19394429 in words is "nineteen million, three hundred ninety-four thousand, four hundred twenty-nine".