305940689 has 2 divisors, whose sum is σ = 305940690. Its totient is φ = 305940688.

The previous prime is 305940667. The next prime is 305940697. The reversal of 305940689 is 986049503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243609664 + 62331025 = 15608^2 + 7895^2 .

It is a cyclic number.

It is not a de Polignac number, because 305940689 - 2²⁸ = 37505233 is a prime.

It is not a weakly prime, because it can be changed into another prime (305940389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152970344 + 152970345.

It is an arithmetic number, because the mean of its divisors is an integer number (152970345).

Almost surely, 2^305940689 is an apocalyptic number.

It is an amenable number.

305940689 is a deficient number, since it is larger than the sum of its proper divisors (1).

305940689 is an equidigital number, since it uses as much as digits as its factorization.

305940689 is an evil number, because the sum of its binary digits is even.

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

The square root of 305940689 is about 17491.1603102824. The cubic root of 305940689 is about 673.8228694779.

The spelling of 305940689 in words is "three hundred five million, nine hundred forty thousand, six hundred eighty-nine".