1680874138 has 4 divisors (see below), whose sum is σ = 2521311210. Its totient is φ = 840437068.

The previous prime is 1680874081. The next prime is 1680874141. The reversal of 1680874138 is 8314780861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8314780861 = 461 ⋅18036401.

It can be written as a sum of positive squares in only one way, i.e., 1668150649 + 12723489 = 40843^2 + 3567^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420218533 + ... + 420218536.

Almost surely, 2^1680874138 is an apocalyptic number.

1680874138 is a deficient number, since it is larger than the sum of its proper divisors (840437072).

1680874138 is an equidigital number, since it uses as much as digits as its factorization.

1680874138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840437071.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 1680874138 is about 40998.4650688291. The cubic root of 1680874138 is about 1188.9905376616.

It can be divided in two parts, 168087 and 4138, that added together give a square (172225 = 415²).

The spelling of 1680874138 in words is "one billion, six hundred eighty million, eight hundred seventy-four thousand, one hundred thirty-eight".