3651966 has 20 divisors (see below), whose sum is σ = 8183472. Its totient is φ = 1217268.

The previous prime is 3651959. The next prime is 3651979. The reversal of 3651966 is 6691563.

It is a self number, because there is not a number n which added to its sum of digits gives 3651966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11110 + ... + 11433.

Almost surely, 2^3651966 is an apocalyptic number.

3651966 is an abundant number, since it is smaller than the sum of its proper divisors (4531506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3651966 is a wasteful number, since it uses less digits than its factorization.

3651966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22557 (or 22548 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 3651966 is about 1911.0117739041. The cubic root of 3651966 is about 153.9958114338.

It can be divided in two parts, 36519 and 66, that added together give a triangular number (36585 = T₂₇₀).

The spelling of 3651966 in words is "three million, six hundred fifty-one thousand, nine hundred sixty-six".