398770913 has 4 divisors (see below), whose sum is σ = 399008148. Its totient is φ = 398533680.

The previous prime is 398770903. The next prime is 398770919. The reversal of 398770913 is 319077893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 231404944 + 167365969 = 15212^2 + 12937^2 .

It is a cyclic number.

It is not a de Polignac number, because 398770913 - 2⁸ = 398770657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398770919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116078 + ... + 119463.

It is an arithmetic number, because the mean of its divisors is an integer number (99752037).

Almost surely, 2^398770913 is an apocalyptic number.

It is an amenable number.

398770913 is a deficient number, since it is larger than the sum of its proper divisors (237235).

398770913 is a wasteful number, since it uses less digits than its factorization.

398770913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237234.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 398770913 is about 19969.2491846839. The cubic root of 398770913 is about 736.0508595771.

The spelling of 398770913 in words is "three hundred ninety-eight million, seven hundred seventy thousand, nine hundred thirteen".