3665951 has 4 divisors (see below), whose sum is σ = 3669792. Its totient is φ = 3662112.

The previous prime is 3665941. The next prime is 3665989. The reversal of 3665951 is 1595663.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1595663 = 31 ⋅51473.

It is a cyclic number.

It is not a de Polignac number, because 3665951 - 2¹⁴ = 3649567 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 (3665911) 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, 746 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (917448).

Almost surely, 2^3665951 is an apocalyptic number.

3665951 is a deficient number, since it is larger than the sum of its proper divisors (3841).

3665951 is a wasteful number, since it uses less digits than its factorization.

3665951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its digits is 24300, while the sum is 35.

The square root of 3665951 is about 1914.6673340296. The cubic root of 3665951 is about 154.1921338335.

The spelling of 3665951 in words is "three million, six hundred sixty-five thousand, nine hundred fifty-one".