19494749 has 2 divisors, whose sum is σ = 19494750. Its totient is φ = 19494748.

The previous prime is 19494743. The next prime is 19494763. The reversal of 19494749 is 94749491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 7812025 = 3418^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 19494749 - 2¹⁶ = 19429213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19494743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9747374 + 9747375.

It is an arithmetic number, because the mean of its divisors is an integer number (9747375).

Almost surely, 2^19494749 is an apocalyptic number.

It is an amenable number.

19494749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19494749 is an equidigital number, since it uses as much as digits as its factorization.

19494749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 19494749 is about 4415.2858344619. The cubic root of 19494749 is about 269.1364683932.

The spelling of 19494749 in words is "nineteen million, four hundred ninety-four thousand, seven hundred forty-nine".