398911807 has 6 divisors (see below), whose sum is σ = 455959608. Its totient is φ = 341879112.

The previous prime is 398911789. The next prime is 398911819. The reversal of 398911807 is 708119893.

It is a de Polignac number, because none of the positive numbers 2^k-398911807 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 (398911207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49069 + ... + 56617.

It is an arithmetic number, because the mean of its divisors is an integer number (75993268).

Almost surely, 2^398911807 is an apocalyptic number.

398911807 is a deficient number, since it is larger than the sum of its proper divisors (57047801).

398911807 is an frugal number, since it uses more digits than its factorization.

398911807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15105 (or 7556 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 398911807 is about 19972.7766472266. The cubic root of 398911807 is about 736.1375366935.

The spelling of 398911807 in words is "three hundred ninety-eight million, nine hundred eleven thousand, eight hundred seven".