19280997 has 10 divisors (see below), whose sum is σ = 28802598. Its totient is φ = 12853944.

The previous prime is 19280993. The next prime is 19280999. The reversal of 19280997 is 79908291.

It can be written as a sum of positive squares in only one way, i.e., 13549761 + 5731236 = 3681^2 + 2394^2 .

It is not a de Polignac number, because 19280997 - 2² = 19280993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19280993) 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 in 9 ways as a sum of consecutive naturals, for example, 118938 + ... + 119099.

Almost surely, 2^19280997 is an apocalyptic number.

It is an amenable number.

19280997 is a deficient number, since it is larger than the sum of its proper divisors (9521601).

19280997 is an equidigital number, since it uses as much as digits as its factorization.

19280997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238049 (or 238040 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 19280997 is about 4391.0132088164. The cubic root of 19280997 is about 268.1491938655.

The spelling of 19280997 in words is "nineteen million, two hundred eighty thousand, nine hundred ninety-seven".