3974843661 has 16 divisors (see below), whose sum is σ = 5619930624. Its totient is φ = 2490292224.

The previous prime is 3974843657. The next prime is 3974843699. The reversal of 3974843661 is 1663484793.

It is not a de Polignac number, because 3974843661 - 2² = 3974843657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3974843651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23581 + ... + 92226.

It is an arithmetic number, because the mean of its divisors is an integer number (351245664).

Almost surely, 2^3974843661 is an apocalyptic number.

It is an amenable number.

3974843661 is a deficient number, since it is larger than the sum of its proper divisors (1645086963).

3974843661 is a wasteful number, since it uses less digits than its factorization.

3974843661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116500.

The product of its digits is 2612736, while the sum is 51.

The square root of 3974843661 is about 63046.3612034826. The cubic root of 3974843661 is about 1584.0662847064.

The spelling of 3974843661 in words is "three billion, nine hundred seventy-four million, eight hundred forty-three thousand, six hundred sixty-one".