3666989 has 4 divisors (see below), whose sum is σ = 3673824. Its totient is φ = 3660156.

The previous prime is 3666979. The next prime is 3666991. The reversal of 3666989 is 9896663.

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 a de Polignac number, because none of the positive numbers 2^k-3666989 is a prime.

It is a super-2 number, since 2×3666989² = 26893616652242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666919) 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, 2537 + ... + 3710.

It is an arithmetic number, because the mean of its divisors is an integer number (918456).

Almost surely, 2^3666989 is an apocalyptic number.

It is an amenable number.

3666989 is a deficient number, since it is larger than the sum of its proper divisors (6835).

3666989 is an equidigital number, since it uses as much as digits as its factorization.

3666989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6834.

The product of its digits is 419904, while the sum is 47.

The square root of 3666989 is about 1914.9383802097. The cubic root of 3666989 is about 154.2066854311.

The spelling of 3666989 in words is "three million, six hundred sixty-six thousand, nine hundred eighty-nine".