3708649 has 4 divisors (see below), whose sum is σ = 4238464. Its totient is φ = 3178836.

The previous prime is 3708643. The next prime is 3708673. The reversal of 3708649 is 9468073.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9468073 = 97 ⋅97609.

It is a cyclic number.

It is not a de Polignac number, because 3708649 - 2³ = 3708641 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3708641) 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, 264897 + ... + 264910.

It is an arithmetic number, because the mean of its divisors is an integer number (1059616).

Almost surely, 2^3708649 is an apocalyptic number.

It is an amenable number.

3708649 is a deficient number, since it is larger than the sum of its proper divisors (529815).

3708649 is an equidigital number, since it uses as much as digits as its factorization.

3708649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529814.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 3708649 is about 1925.7852943669. The cubic root of 3708649 is about 154.7884592571.

The spelling of 3708649 in words is "three million, seven hundred eight thousand, six hundred forty-nine".