19413893 has 2 divisors, whose sum is σ = 19413894. Its totient is φ = 19413892.

The previous prime is 19413857. The next prime is 19413931. The reversal of 19413893 is 39831491.

It is a happy number.

It is an a-pointer prime, because the next prime (19413931) can be obtained adding 19413893 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19166884 + 247009 = 4378^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 19413893 - 2⁶ = 19413829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19413833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9706946 + 9706947.

It is an arithmetic number, because the mean of its divisors is an integer number (9706947).

Almost surely, 2^19413893 is an apocalyptic number.

It is an amenable number.

19413893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19413893 is an equidigital number, since it uses as much as digits as its factorization.

19413893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 19413893 is about 4406.1199484354. The cubic root of 19413893 is about 268.7638645813.

The spelling of 19413893 in words is "nineteen million, four hundred thirteen thousand, eight hundred ninety-three".