684017387 has 4 divisors (see below), whose sum is σ = 706082496. Its totient is φ = 661952280.

The previous prime is 684017381. The next prime is 684017393. The reversal of 684017387 is 783710486.

684017387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (684017381) and next prime (684017393).

It is a cyclic number.

It is not a de Polignac number, because 684017387 - 2²⁸ = 415581931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684017381) 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, 11032508 + ... + 11032569.

It is an arithmetic number, because the mean of its divisors is an integer number (176520624).

Almost surely, 2^684017387 is an apocalyptic number.

684017387 is a deficient number, since it is larger than the sum of its proper divisors (22065109).

684017387 is a wasteful number, since it uses less digits than its factorization.

684017387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22065108.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 684017387 is about 26153.7260634121. The cubic root of 684017387 is about 881.0942770498.

The spelling of 684017387 in words is "six hundred eighty-four million, seventeen thousand, three hundred eighty-seven".