19394149 has 2 divisors, whose sum is σ = 19394150. Its totient is φ = 19394148.

The previous prime is 19394143. The next prime is 19394153. The reversal of 19394149 is 94149391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 9345249 = 3170^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 19394149 - 2¹³ = 19385957 is a prime.

It is a super-2 number, since 2×19394149² = 752266030868402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19394143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9697074 + 9697075.

It is an arithmetic number, because the mean of its divisors is an integer number (9697075).

Almost surely, 2^19394149 is an apocalyptic number.

It is an amenable number.

19394149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19394149 is an equidigital number, since it uses as much as digits as its factorization.

19394149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 19394149 is about 4403.8788584610. The cubic root of 19394149 is about 268.6727224001.

The spelling of 19394149 in words is "nineteen million, three hundred ninety-four thousand, one hundred forty-nine".