398066505 has 16 divisors (see below), whose sum is σ = 657452544. Its totient is φ = 205453440.

The previous prime is 398066503. The next prime is 398066507. The reversal of 398066505 is 505660893.

It is an interprime number because it is at equal distance from previous prime (398066503) and next prime (398066507).

It is not a de Polignac number, because 398066505 - 2¹ = 398066503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398066503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427564 + ... + 428493.

It is an arithmetic number, because the mean of its divisors is an integer number (41090784).

Almost surely, 2^398066505 is an apocalyptic number.

It is an amenable number.

398066505 is a deficient number, since it is larger than the sum of its proper divisors (259386039).

398066505 is a wasteful number, since it uses less digits than its factorization.

398066505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856096.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 398066505 is about 19951.6040708510. The cubic root of 398066505 is about 735.6172056618.

The spelling of 398066505 in words is "three hundred ninety-eight million, sixty-six thousand, five hundred five".