3661387 has 4 divisors (see below), whose sum is σ = 3669336. Its totient is φ = 3653440.

The previous prime is 3661381. The next prime is 3661391. The reversal of 3661387 is 7831663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7831663 = 7 ⋅1118809.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238 + ... + 4219.

It is an arithmetic number, because the mean of its divisors is an integer number (917334).

Almost surely, 2^3661387 is an apocalyptic number.

3661387 is a deficient number, since it is larger than the sum of its proper divisors (7949).

3661387 is an equidigital number, since it uses as much as digits as its factorization.

3661387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7948.

The product of its digits is 18144, while the sum is 34.

The square root of 3661387 is about 1913.4751108912. The cubic root of 3661387 is about 154.1281190533.

The spelling of 3661387 in words is "three million, six hundred sixty-one thousand, three hundred eighty-seven".