1680897940 has 24 divisors (see below), whose sum is σ = 3531330432. Its totient is φ = 672084000.

The previous prime is 1680897923. The next prime is 1680897941. The reversal of 1680897940 is 497980861.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680897941) 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, 37065 + ... + 68815.

It is an arithmetic number, because the mean of its divisors is an integer number (147138768).

Almost surely, 2^1680897940 is an apocalyptic number.

1680897940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680897940 is an abundant number, since it is smaller than the sum of its proper divisors (1850432492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680897940 is a wasteful number, since it uses less digits than its factorization.

1680897940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34407 (or 34405 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1680897940 is about 40998.7553469614. The cubic root of 1680897940 is about 1188.9961498643.

The spelling of 1680897940 in words is "one billion, six hundred eighty million, eight hundred ninety-seven thousand, nine hundred forty".