398613505 has 8 divisors (see below), whose sum is σ = 478481832. Its totient is φ = 318793728.

The previous prime is 398613487. The next prime is 398613541. The reversal of 398613505 is 505316893.

It can be written as a sum of positive squares in 4 ways, for example, as 67519089 + 331094416 = 8217^2 + 18196^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 398613505 - 2⁷ = 398613377 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, 9409 + ... + 29761.

It is an arithmetic number, because the mean of its divisors is an integer number (59810229).

Almost surely, 2^398613505 is an apocalyptic number.

It is an amenable number.

398613505 is a deficient number, since it is larger than the sum of its proper divisors (79868327).

398613505 is a wasteful number, since it uses less digits than its factorization.

398613505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24275.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 398613505 is about 19965.3075358232. The cubic root of 398613505 is about 735.9539990005.

The spelling of 398613505 in words is "three hundred ninety-eight million, six hundred thirteen thousand, five hundred five".