306880394 has 4 divisors (see below), whose sum is σ = 460320594. Its totient is φ = 153440196.

The previous prime is 306880391. The next prime is 306880403. The reversal of 306880394 is 493088603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 233692369 + 73188025 = 15287^2 + 8555^2 .

It is not an unprimeable number, because it can be changed into a prime (306880391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76720097 + ... + 76720100.

Almost surely, 2^306880394 is an apocalyptic number.

306880394 is a deficient number, since it is larger than the sum of its proper divisors (153440200).

306880394 is a wasteful number, since it uses less digits than its factorization.

306880394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153440199.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 306880394 is about 17518.0019979449. The cubic root of 306880394 is about 674.5120526593.

The spelling of 306880394 in words is "three hundred six million, eight hundred eighty thousand, three hundred ninety-four".