3978891124 has 48 divisors (see below), whose sum is σ = 7573000960. Its totient is φ = 1818288000.

The previous prime is 3978891107. The next prime is 3978891139. The reversal of 3978891124 is 4211988793.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5297749 + ... + 5298499.

Almost surely, 2^3978891124 is an apocalyptic number.

It is an amenable number.

3978891124 is a deficient number, since it is larger than the sum of its proper divisors (3594109836).

3978891124 is a wasteful number, since it uses less digits than its factorization.

3978891124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1638 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 3978891124 is about 63078.4521370016. The cubic root of 3978891124 is about 1584.6037712307.

The spelling of 3978891124 in words is "three billion, nine hundred seventy-eight million, eight hundred ninety-one thousand, one hundred twenty-four".