1787980097 has 4 divisors (see below), whose sum is σ = 1794937476. Its totient is φ = 1781022720.

The previous prime is 1787980067. The next prime is 1787980109. The reversal of 1787980097 is 7900897871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1594325041 + 193655056 = 39929^2 + 13916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1787980097 - 2¹⁰ = 1787979073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1787980037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478304 + ... + 3478817.

It is an arithmetic number, because the mean of its divisors is an integer number (448734369).

Almost surely, 2^1787980097 is an apocalyptic number.

It is an amenable number.

1787980097 is a deficient number, since it is larger than the sum of its proper divisors (6957379).

1787980097 is an equidigital number, since it uses as much as digits as its factorization.

1787980097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6957378.

The product of its (nonzero) digits is 1778112, while the sum is 56.

The square root of 1787980097 is about 42284.5136781777. The cubic root of 1787980097 is about 1213.7266652281.

The spelling of 1787980097 in words is "one billion, seven hundred eighty-seven million, nine hundred eighty thousand, ninety-seven".