3961640725 has 12 divisors (see below), whose sum is σ = 5614211104. Its totient is φ = 2716553520.

The previous prime is 3961640719. The next prime is 3961640731. The reversal of 3961640725 is 5270461693.

3961640725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3961640719) and next prime (3961640731).

It is not a de Polignac number, because 3961640725 - 2³ = 3961640717 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, 11318799 + ... + 11319148.

Almost surely, 2^3961640725 is an apocalyptic number.

3961640725 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3961640725 is a deficient number, since it is larger than the sum of its proper divisors (1652570379).

3961640725 is a wasteful number, since it uses less digits than its factorization.

3961640725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22637964 (or 22637959 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 3961640725 is about 62941.5659560516. The cubic root of 3961640725 is about 1582.3104483434.

The spelling of 3961640725 in words is "three billion, nine hundred sixty-one million, six hundred forty thousand, seven hundred twenty-five".