3681998838 has 48 divisors (see below), whose sum is σ = 9513743616. Its totient is φ = 1006259760.

The previous prime is 3681998813. The next prime is 3681998843. The reversal of 3681998838 is 8388991863.

3681998838 is a `hidden beast` number, since 368 + 199 + 8 + 83 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 632368 + ... + 638163.

It is an arithmetic number, because the mean of its divisors is an integer number (198202992).

Almost surely, 2^3681998838 is an apocalyptic number.

3681998838 is an abundant number, since it is smaller than the sum of its proper divisors (5831744778).

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

3681998838 is a wasteful number, since it uses less digits than its factorization.

3681998838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270569 (or 1270566 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 63.

The square root of 3681998838 is about 60679.4762502117. The cubic root of 3681998838 is about 1544.1680027285.

The spelling of 3681998838 in words is "three billion, six hundred eighty-one million, nine hundred ninety-eight thousand, eight hundred thirty-eight".