307813 has 4 divisors (see below), whose sum is σ = 335808. Its totient is φ = 279820.

The previous prime is 307759. The next prime is 307817. The reversal of 307813 is 318703.

It is the 227-th star number.

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.

It is a cyclic number.

It is not a de Polignac number, because 307813 - 2⁹ = 307301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307817) 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, 13981 + ... + 14002.

It is an arithmetic number, because the mean of its divisors is an integer number (83952).

2³⁰⁷⁸¹³ is an apocalyptic number.

It is an amenable number.

307813 is a deficient number, since it is larger than the sum of its proper divisors (27995).

307813 is a wasteful number, since it uses less digits than its factorization.

307813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27994.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 307813 is about 554.8089761350. The cubic root of 307813 is about 67.5194639800.

The spelling of 307813 in words is "three hundred seven thousand, eight hundred thirteen".