1919947 has 2 divisors, whose sum is σ = 1919948. Its totient is φ = 1919946.

The previous prime is 1919927. The next prime is 1919959. The reversal of 1919947 is 7499191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1919947 - 2¹¹ = 1917899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1919917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959973 + 959974.

It is an arithmetic number, because the mean of its divisors is an integer number (959974).

2^1919947 is an apocalyptic number.

1919947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919947 is an equidigital number, since it uses as much as digits as its factorization.

1919947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 40.

The square root of 1919947 is about 1385.6215211955. The cubic root of 1919947 is about 124.2881565934.

The spelling of 1919947 in words is "one million, nine hundred nineteen thousand, nine hundred forty-seven".