19402489 has 2 divisors, whose sum is σ = 19402490. Its totient is φ = 19402488.

The previous prime is 19402447. The next prime is 19402499. The reversal of 19402489 is 98420491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 218089 = 4380^2 + 467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19402489 is a prime.

It is not a weakly prime, because it can be changed into another prime (19402499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9701244 + 9701245.

It is an arithmetic number, because the mean of its divisors is an integer number (9701245).

Almost surely, 2^19402489 is an apocalyptic number.

It is an amenable number.

19402489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19402489 is an equidigital number, since it uses as much as digits as its factorization.

19402489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 19402489 is about 4404.8256492170. The cubic root of 19402489 is about 268.7112290203.

It can be divided in two parts, 19402 and 489, that added together give a palindrome (19891).

The spelling of 19402489 in words is "nineteen million, four hundred two thousand, four hundred eighty-nine".