398742685 has 8 divisors (see below), whose sum is σ = 521990496. Its totient is φ = 289994640.

The previous prime is 398742679. The next prime is 398742703. The reversal of 398742685 is 586247893.

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

It is not a de Polignac number, because 398742685 - 2²¹ = 396645533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3624879 + ... + 3624988.

It is an arithmetic number, because the mean of its divisors is an integer number (65248812).

Almost surely, 2^398742685 is an apocalyptic number.

It is an amenable number.

398742685 is a deficient number, since it is larger than the sum of its proper divisors (123247811).

398742685 is a wasteful number, since it uses less digits than its factorization.

398742685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249883.

The product of its digits is 2903040, while the sum is 52.

The square root of 398742685 is about 19968.5423854622. The cubic root of 398742685 is about 736.0334914314.

The spelling of 398742685 in words is "three hundred ninety-eight million, seven hundred forty-two thousand, six hundred eighty-five".