19402897 has 2 divisors, whose sum is σ = 19402898. Its totient is φ = 19402896.

The previous prime is 19402879. The next prime is 19402907. The reversal of 19402897 is 79820491.

Together with previous prime (19402879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 3530641 = 3984^2 + 1879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402897 is a prime.

It is not a weakly prime, because it can be changed into another prime (19400897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701448 + 9701449.

It is an arithmetic number, because the mean of its divisors is an integer number (9701449).

Almost surely, 2^19402897 is an apocalyptic number.

It is an amenable number.

19402897 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402897 is an equidigital number, since it uses as much as digits as its factorization.

19402897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 19402897 is about 4404.8719618168. The cubic root of 19402897 is about 268.7131125143.

The spelling of 19402897 in words is "nineteen million, four hundred two thousand, eight hundred ninety-seven".