398647007 has 4 divisors (see below), whose sum is σ = 434887656. Its totient is φ = 362406360.

The previous prime is 398647001. The next prime is 398647009. The reversal of 398647007 is 700746893.

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

It is a cyclic number.

It is not a de Polignac number, because 398647007 - 2⁸ = 398646751 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 (398647001) 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, 18120308 + ... + 18120329.

It is an arithmetic number, because the mean of its divisors is an integer number (108721914).

Almost surely, 2^398647007 is an apocalyptic number.

398647007 is a deficient number, since it is larger than the sum of its proper divisors (36240649).

398647007 is a wasteful number, since it uses less digits than its factorization.

398647007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36240648.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 398647007 is about 19966.1465235533. The cubic root of 398647007 is about 735.9746164991.

The spelling of 398647007 in words is "three hundred ninety-eight million, six hundred forty-seven thousand, seven".