3977661 has 8 divisors (see below), whose sum is σ = 5320224. Its totient is φ = 2643440.

The previous prime is 3977653. The next prime is 3977663. The reversal of 3977661 is 1667793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3977661 - 2³ = 3977653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 870 + ... + 2951.

It is an arithmetic number, because the mean of its divisors is an integer number (665028).

Almost surely, 2^3977661 is an apocalyptic number.

It is an amenable number.

3977661 is a deficient number, since it is larger than the sum of its proper divisors (1342563).

3977661 is a wasteful number, since it uses less digits than its factorization.

3977661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171.

The product of its digits is 47628, while the sum is 39.

The square root of 3977661 is about 1994.4074307924. The cubic root of 3977661 is about 158.4440454368. Note that the first 3 decimals are identical.

The spelling of 3977661 in words is "three million, nine hundred seventy-seven thousand, six hundred sixty-one".