307649 has 4 divisors (see below), whose sum is σ = 325764. Its totient is φ = 289536.

The previous prime is 307639. The next prime is 307651. The reversal of 307649 is 946703.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 946703 = 23 ⋅41161.

It can be written as a sum of positive squares in 2 ways, for example, as 135424 + 172225 = 368^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 307649 - 2⁴ = 307633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (307609) 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, 9032 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (81441).

2³⁰⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

307649 is a deficient number, since it is larger than the sum of its proper divisors (18115).

307649 is a wasteful number, since it uses less digits than its factorization.

307649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18114.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 307649 is about 554.6611578252. The cubic root of 307649 is about 67.5074705952.

It can be divided in two parts, 3076 and 49, that added together give a 5-th power (3125 = 5⁵).

The spelling of 307649 in words is "three hundred seven thousand, six hundred forty-nine".