1683540646 has 4 divisors (see below), whose sum is σ = 2525310972. Its totient is φ = 841770322.

The previous prime is 1683540641. The next prime is 1683540679. The reversal of 1683540646 is 6460453861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6460453861 = 28051 ⋅230311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1683540641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420885160 + ... + 420885163.

It is an arithmetic number, because the mean of its divisors is an integer number (631327743).

Almost surely, 2^1683540646 is an apocalyptic number.

1683540646 is a deficient number, since it is larger than the sum of its proper divisors (841770326).

1683540646 is an equidigital number, since it uses as much as digits as its factorization.

1683540646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841770325.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 1683540646 is about 41030.9717896128. The cubic root of 1683540646 is about 1189.6189364352.

The spelling of 1683540646 in words is "one billion, six hundred eighty-three million, five hundred forty thousand, six hundred forty-six".