398718685 has 8 divisors (see below), whose sum is σ = 499265280. Its totient is φ = 305106384.

The previous prime is 398718647. The next prime is 398718689. The reversal of 398718685 is 586817893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398718685 - 2⁷ = 398718557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398718689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1733445 + ... + 1733674.

It is an arithmetic number, because the mean of its divisors is an integer number (62408160).

Almost surely, 2^398718685 is an apocalyptic number.

It is an amenable number.

398718685 is a deficient number, since it is larger than the sum of its proper divisors (100546595).

398718685 is a wasteful number, since it uses less digits than its factorization.

398718685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467147.

The product of its digits is 2903040, while the sum is 55.

The square root of 398718685 is about 19967.9414312042. The cubic root of 398718685 is about 736.0187240481.

The spelling of 398718685 in words is "three hundred ninety-eight million, seven hundred eighteen thousand, six hundred eighty-five".