1680040793 has 8 divisors (see below), whose sum is σ = 1779268968. Its totient is φ = 1580857344.

The previous prime is 1680040787. The next prime is 1680040823. The reversal of 1680040793 is 3970400861.

It can be written as a sum of positive squares in 4 ways, for example, as 1302632464 + 377408329 = 36092^2 + 19427^2 .

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 1680040793 - 2⁶ = 1680040729 is a prime.

It is a super-2 number, since 2×1680040793² = 5645074132288137698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1680040783) 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, 95105 + ... + 111377.

It is an arithmetic number, because the mean of its divisors is an integer number (222408621).

Almost surely, 2^1680040793 is an apocalyptic number.

It is an amenable number.

1680040793 is a deficient number, since it is larger than the sum of its proper divisors (99228175).

1680040793 is a wasteful number, since it uses less digits than its factorization.

1680040793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22363.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1680040793 is about 40988.3006844636. The cubic root of 1680040793 is about 1188.7940123163.

The spelling of 1680040793 in words is "one billion, six hundred eighty million, forty thousand, seven hundred ninety-three".