398691006 has 16 divisors (see below), whose sum is σ = 911293824. Its totient is φ = 113911704.

The previous prime is 398691001. The next prime is 398691017. The reversal of 398691006 is 600196893.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 9492643 = 398691006 / (3 + 9 + 8 + 6 + 9 + 1 + 0 + 0 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398691001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4746280 + ... + 4746363.

It is an arithmetic number, because the mean of its divisors is an integer number (56955864).

Almost surely, 2^398691006 is an apocalyptic number.

398691006 is an abundant number, since it is smaller than the sum of its proper divisors (512602818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398691006 is a wasteful number, since it uses less digits than its factorization.

398691006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492655.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 398691006 is about 19967.2483332081. The cubic root of 398691006 is about 736.0016922122.

The spelling of 398691006 in words is "three hundred ninety-eight million, six hundred ninety-one thousand, six".