19223947 has 2 divisors, whose sum is σ = 19223948. Its totient is φ = 19223946.

The previous prime is 19223921. The next prime is 19223983. The reversal of 19223947 is 74932291.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19223947 - 2⁷ = 19223819 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (19223917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9611973 + 9611974.

It is an arithmetic number, because the mean of its divisors is an integer number (9611974).

Almost surely, 2^19223947 is an apocalyptic number.

19223947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19223947 is an equidigital number, since it uses as much as digits as its factorization.

19223947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 19223947 is about 4384.5121735491. The cubic root of 19223947 is about 267.8844595514.

The spelling of 19223947 in words is "nineteen million, two hundred twenty-three thousand, nine hundred forty-seven".