19780379 has 2 divisors, whose sum is σ = 19780380. Its totient is φ = 19780378.

The previous prime is 19780361. The next prime is 19780381. The reversal of 19780379 is 97308791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19780379 - 2¹⁶ = 19714843 is a prime.

Together with 19780381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19780679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9890189 + 9890190.

It is an arithmetic number, because the mean of its divisors is an integer number (9890190).

Almost surely, 2^19780379 is an apocalyptic number.

19780379 is a deficient number, since it is larger than the sum of its proper divisors (1).

19780379 is an equidigital number, since it uses as much as digits as its factorization.

19780379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 19780379 is about 4447.5137998662. The cubic root of 19780379 is about 270.4445306360. Note that the first 3 decimals are identical.

The spelling of 19780379 in words is "nineteen million, seven hundred eighty thousand, three hundred seventy-nine".