1780982109 has 24 divisors (see below), whose sum is σ = 2587944320. Its totient is φ = 1180230912.

The previous prime is 1780982107. The next prime is 1780982111. The reversal of 1780982109 is 9012890871.

It is an interprime number because it is at equal distance from previous prime (1780982107) and next prime (1780982111).

It is not a de Polignac number, because 1780982109 - 2¹ = 1780982107 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780982107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1713612 + ... + 1714650.

Almost surely, 2^1780982109 is an apocalyptic number.

It is an amenable number.

1780982109 is a deficient number, since it is larger than the sum of its proper divisors (806962211).

1780982109 is a wasteful number, since it uses less digits than its factorization.

1780982109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001 (or 1998 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 1780982109 is about 42201.6837223351. The cubic root of 1780982109 is about 1212.1411237331.

The spelling of 1780982109 in words is "one billion, seven hundred eighty million, nine hundred eighty-two thousand, one hundred nine".