3986407661 has 4 divisors (see below), whose sum is σ = 4025110752. Its totient is φ = 3947704572.

The previous prime is 3986407637. The next prime is 3986407681. The reversal of 3986407661 is 1667046893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3986407661 - 2¹⁰ = 3986406637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3986407681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19351391 + ... + 19351596.

It is an arithmetic number, because the mean of its divisors is an integer number (1006277688).

Almost surely, 2^3986407661 is an apocalyptic number.

It is an amenable number.

3986407661 is a deficient number, since it is larger than the sum of its proper divisors (38703091).

3986407661 is a wasteful number, since it uses less digits than its factorization.

3986407661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38703090.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 3986407661 is about 63138.0048861223. The cubic root of 3986407661 is about 1585.6009703804.

The spelling of 3986407661 in words is "three billion, nine hundred eighty-six million, four hundred seven thousand, six hundred sixty-one".