398967505 has 8 divisors (see below), whose sum is σ = 478923624. Its totient is φ = 319065600.

The previous prime is 398967497. The next prime is 398967521. The reversal of 398967505 is 505769893.

It can be written as a sum of positive squares in 4 ways, for example, as 210482064 + 188485441 = 14508^2 + 13729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398967505 - 2³ = 398967497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4935 + ... + 28675.

It is an arithmetic number, because the mean of its divisors is an integer number (59865453).

Almost surely, 2^398967505 is an apocalyptic number.

It is an amenable number.

398967505 is a deficient number, since it is larger than the sum of its proper divisors (79956119).

398967505 is a wasteful number, since it uses less digits than its factorization.

398967505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27107.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The square root of 398967505 is about 19974.1709464999. The cubic root of 398967505 is about 736.1717961293.

The spelling of 398967505 in words is "three hundred ninety-eight million, nine hundred sixty-seven thousand, five hundred five".