3654989 has 4 divisors (see below), whose sum is σ = 3936156. Its totient is φ = 3373824.

The previous prime is 3654961. The next prime is 3654997. The reversal of 3654989 is 9894563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9894563 = 7 ⋅1413509.

It can be written as a sum of positive squares in 2 ways, for example, as 432964 + 3222025 = 658^2 + 1795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3654989 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140564 + ... + 140589.

It is an arithmetic number, because the mean of its divisors is an integer number (984039).

Almost surely, 2^3654989 is an apocalyptic number.

It is an amenable number.

3654989 is a deficient number, since it is larger than the sum of its proper divisors (281167).

3654989 is a wasteful number, since it uses less digits than its factorization.

3654989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281166.

The product of its digits is 233280, while the sum is 44.

The square root of 3654989 is about 1911.8025525666. The cubic root of 3654989 is about 154.0382909226.

The spelling of 3654989 in words is "three million, six hundred fifty-four thousand, nine hundred eighty-nine".