19671493 has 2 divisors, whose sum is σ = 19671494. Its totient is φ = 19671492.

The previous prime is 19671469. The next prime is 19671497. The reversal of 19671493 is 39417691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 161604 = 4417^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 19671493 - 2⁵ = 19671461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19671497) 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, 9835746 + 9835747.

It is an arithmetic number, because the mean of its divisors is an integer number (9835747).

Almost surely, 2^19671493 is an apocalyptic number.

It is an amenable number.

19671493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19671493 is an equidigital number, since it uses as much as digits as its factorization.

19671493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 19671493 is about 4435.2556859780. The cubic root of 19671493 is about 269.9473742884.

It can be divided in two parts, 19671 and 493, that added together give a square (20164 = 142²).

The spelling of 19671493 in words is "nineteen million, six hundred seventy-one thousand, four hundred ninety-three".