19894297 has 2 divisors, whose sum is σ = 19894298. Its totient is φ = 19894296.

The previous prime is 19894291. The next prime is 19894321. The reversal of 19894297 is 79249891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 145161 = 4444^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 19894297 - 2³ = 19894289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19894297.

It is not a weakly prime, because it can be changed into another prime (19894291) 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, 9947148 + 9947149.

It is an arithmetic number, because the mean of its divisors is an integer number (9947149).

Almost surely, 2^19894297 is an apocalyptic number.

It is an amenable number.

19894297 is a deficient number, since it is larger than the sum of its proper divisors (1).

19894297 is an equidigital number, since it uses as much as digits as its factorization.

19894297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 19894297 is about 4460.3023440121. The cubic root of 19894297 is about 270.9627132425.

It can be divided in two parts, 1989429 and 7, that multiplied together give a triangular number (13926003 = T₅₂₇₇).

The spelling of 19894297 in words is "nineteen million, eight hundred ninety-four thousand, two hundred ninety-seven".