398705135 has 4 divisors (see below), whose sum is σ = 478446168. Its totient is φ = 318964104.

The previous prime is 398705129. The next prime is 398705143. The reversal of 398705135 is 531507893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531507893 = 7 ⋅75929699.

It is a cyclic number.

It is not a de Polignac number, because 398705135 - 2⁴ = 398705119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398705092 and 398705101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39870509 + ... + 39870518.

It is an arithmetic number, because the mean of its divisors is an integer number (119611542).

Almost surely, 2^398705135 is an apocalyptic number.

398705135 is a deficient number, since it is larger than the sum of its proper divisors (79741033).

398705135 is an equidigital number, since it uses as much as digits as its factorization.

398705135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79741032.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 398705135 is about 19967.6021344577. The cubic root of 398705135 is about 736.0103863679.

The spelling of 398705135 in words is "three hundred ninety-eight million, seven hundred five thousand, one hundred thirty-five".