1684681938 has 24 divisors (see below), whose sum is σ = 3660104448. Its totient is φ = 560028312.

The previous prime is 1684681927. The next prime is 1684681939. The reversal of 1684681938 is 8391864861.

1684681938 is a `hidden beast` number, since 168 + 468 + 19 + 3 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1684681939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120906 + ... + 134117.

It is an arithmetic number, because the mean of its divisors is an integer number (152504352).

Almost surely, 2^1684681938 is an apocalyptic number.

1684681938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1684681938 is an abundant number, since it is smaller than the sum of its proper divisors (1975422510).

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

1684681938 is a wasteful number, since it uses less digits than its factorization.

1684681938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255398 (or 255395 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 1684681938 is about 41044.8771224863. The cubic root of 1684681938 is about 1189.8876946013.

The spelling of 1684681938 in words is "one billion, six hundred eighty-four million, six hundred eighty-one thousand, nine hundred thirty-eight".