1680626940 has 48 divisors (see below), whose sum is σ = 4805885952. Its totient is φ = 438630976.

The previous prime is 1680626939. The next prime is 1680626993. The reversal of 1680626940 is 496260861.

It is a super-2 number, since 2×1680626940² = 5649013822907527200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1680626892 and 1680626901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295164 + ... + 300803.

It is an arithmetic number, because the mean of its divisors is an integer number (100122624).

Almost surely, 2^1680626940 is an apocalyptic number.

1680626940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680626940 is an abundant number, since it is smaller than the sum of its proper divisors (3125259012).

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

1680626940 is a wasteful number, since it uses less digits than its factorization.

1680626940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596026 (or 596024 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1680626940 is about 40995.4502353615. The cubic root of 1680626940 is about 1188.9322484486.

The spelling of 1680626940 in words is "one billion, six hundred eighty million, six hundred twenty-six thousand, nine hundred forty".