398191607 has 16 divisors (see below), whose sum is σ = 462412800. Its totient is φ = 339071040.

The previous prime is 398191603. The next prime is 398191613. The reversal of 398191607 is 706191893.

It is not a de Polignac number, because 398191607 - 2² = 398191603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398191601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7898 + ... + 29304.

It is an arithmetic number, because the mean of its divisors is an integer number (28900800).

Almost surely, 2^398191607 is an apocalyptic number.

398191607 is a deficient number, since it is larger than the sum of its proper divisors (64221193).

398191607 is a wasteful number, since it uses less digits than its factorization.

398191607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21526.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 398191607 is about 19954.7389609586. The cubic root of 398191607 is about 735.6942594067.

The spelling of 398191607 in words is "three hundred ninety-eight million, one hundred ninety-one thousand, six hundred seven".