3621749 has 4 divisors (see below), whose sum is σ = 3671436. Its totient is φ = 3572064.

The previous prime is 3621733. The next prime is 3621767. The reversal of 3621749 is 9471263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9471263 = 1913 ⋅4951.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 2992900 = 793^2 + 1730^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621749 - 2⁴ = 3621733 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 (3621049) 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, 24734 + ... + 24879.

It is an arithmetic number, because the mean of its divisors is an integer number (917859).

Almost surely, 2^3621749 is an apocalyptic number.

It is an amenable number.

3621749 is a deficient number, since it is larger than the sum of its proper divisors (49687).

3621749 is an equidigital number, since it uses as much as digits as its factorization.

3621749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49686.

The product of its digits is 9072, while the sum is 32.

The square root of 3621749 is about 1903.0893305360. The cubic root of 3621749 is about 153.5699052413.

The spelling of 3621749 in words is "three million, six hundred twenty-one thousand, seven hundred forty-nine".