3994728838 has 16 divisors (see below), whose sum is σ = 6095324160. Its totient is φ = 1963008000.

The previous prime is 3994728737. The next prime is 3994728839. The reversal of 3994728838 is 8388274993.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994728839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143238 + ... + 168838.

It is an arithmetic number, because the mean of its divisors is an integer number (380957760).

Almost surely, 2^3994728838 is an apocalyptic number.

3994728838 is a deficient number, since it is larger than the sum of its proper divisors (2100595322).

3994728838 is a wasteful number, since it uses less digits than its factorization.

3994728838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26943.

The product of its digits is 20901888, while the sum is 61.

The square root of 3994728838 is about 63203.8672709194. The cubic root of 3994728838 is about 1586.7034581089.

The spelling of 3994728838 in words is "three billion, nine hundred ninety-four million, seven hundred twenty-eight thousand, eight hundred thirty-eight".