1680340381 has 8 divisors (see below), whose sum is σ = 1735378560. Its totient is φ = 1626105888.

The previous prime is 1680340327. The next prime is 1680340391. The reversal of 1680340381 is 1830430861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1680340381 - 2¹³ = 1680332189 is a prime.

It is a super-2 number, since 2×1680340381² = 5647087592038450322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680340391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196671 + ... + 205036.

It is an arithmetic number, because the mean of its divisors is an integer number (216922320).

Almost surely, 2^1680340381 is an apocalyptic number.

It is an amenable number.

1680340381 is a deficient number, since it is larger than the sum of its proper divisors (55038179).

1680340381 is an equidigital number, since it uses as much as digits as its factorization.

1680340381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401843.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1680340381 is about 40991.9550765757. The cubic root of 1680340381 is about 1188.8646707699.

The spelling of 1680340381 in words is "one billion, six hundred eighty million, three hundred forty thousand, three hundred eighty-one".