3978738925 has 12 divisors (see below), whose sum is σ = 5638441696. Its totient is φ = 2728278000.

The previous prime is 3978738913. The next prime is 3978738941. The reversal of 3978738925 is 5298378793.

It is not a de Polignac number, because 3978738925 - 2²⁹ = 3441868013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11367651 + ... + 11368000.

Almost surely, 2^3978738925 is an apocalyptic number.

3978738925 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3978738925 is a deficient number, since it is larger than the sum of its proper divisors (1659702771).

3978738925 is a wasteful number, since it uses less digits than its factorization.

3978738925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22735668 (or 22735663 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 61.

The square root of 3978738925 is about 63077.2456992218. The cubic root of 3978738925 is about 1584.5835664235.

The spelling of 3978738925 in words is "three billion, nine hundred seventy-eight million, seven hundred thirty-eight thousand, nine hundred twenty-five".