398207965 has 4 divisors (see below), whose sum is σ = 477849564. Its totient is φ = 318566368.

The previous prime is 398207941. The next prime is 398207969. The reversal of 398207965 is 569702893.

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 274598041 + 123609924 = 16571^2 + 11118^2 .

It is a cyclic number.

It is not a de Polignac number, because 398207965 - 2¹¹ = 398205917 is a prime.

It is a super-3 number, since 3×398207965³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398207969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39820792 + ... + 39820801.

It is an arithmetic number, because the mean of its divisors is an integer number (119462391).

Almost surely, 2^398207965 is an apocalyptic number.

It is an amenable number.

398207965 is a deficient number, since it is larger than the sum of its proper divisors (79641599).

398207965 is an equidigital number, since it uses as much as digits as its factorization.

398207965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79641598.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 398207965 is about 19955.1488343234. The cubic root of 398207965 is about 735.7043335533.

The spelling of 398207965 in words is "three hundred ninety-eight million, two hundred seven thousand, nine hundred sixty-five".