19428449 has 2 divisors, whose sum is σ = 19428450. Its totient is φ = 19428448.

The previous prime is 19428443. The next prime is 19428457. The reversal of 19428449 is 94482491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 2122849 = 4160^2 + 1457^2 .

It is a cyclic number.

It is not a de Polignac number, because 19428449 - 2⁸ = 19428193 is a prime.

It is not a weakly prime, because it can be changed into another prime (19428443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9714224 + 9714225.

It is an arithmetic number, because the mean of its divisors is an integer number (9714225).

Almost surely, 2^19428449 is an apocalyptic number.

It is an amenable number.

19428449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19428449 is an equidigital number, since it uses as much as digits as its factorization.

19428449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 19428449 is about 4407.7714323681. The cubic root of 19428449 is about 268.8310183714.

The spelling of 19428449 in words is "nineteen million, four hundred twenty-eight thousand, four hundred forty-nine".