398650169 has 4 divisors (see below), whose sum is σ = 402307620. Its totient is φ = 394992720.

The previous prime is 398650163. The next prime is 398650177. The reversal of 398650169 is 961056893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 961056893 = 47 ⋅20448019.

It can be written as a sum of positive squares in 2 ways, for example, as 138956944 + 259693225 = 11788^2 + 16115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398650169 is a prime.

It is a super-2 number, since 2×398650169² = 317843914487457122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398650163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828562 + ... + 1828779.

It is an arithmetic number, because the mean of its divisors is an integer number (100576905).

Almost surely, 2^398650169 is an apocalyptic number.

It is an amenable number.

398650169 is a deficient number, since it is larger than the sum of its proper divisors (3657451).

398650169 is a wasteful number, since it uses less digits than its factorization.

398650169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657450.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 398650169 is about 19966.2257074290. The cubic root of 398650169 is about 735.9765623690.

The spelling of 398650169 in words is "three hundred ninety-eight million, six hundred fifty thousand, one hundred sixty-nine".