398426265 has 12 divisors (see below), whose sum is σ = 690605604. Its totient is φ = 212493984.

The previous prime is 398426251. The next prime is 398426267. The reversal of 398426265 is 562624893.

It can be written as a sum of positive squares in 2 ways, for example, as 58798224 + 339628041 = 7668^2 + 18429^2 .

It is not a de Polignac number, because 398426265 - 2⁷ = 398426137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 8853917 = 398426265 / (3 + 9 + 8 + 4 + 2 + 6 + 2 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 398426265.

It is not an unprimeable number, because it can be changed into a prime (398426267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4426914 + ... + 4427003.

It is an arithmetic number, because the mean of its divisors is an integer number (57550467).

Almost surely, 2^398426265 is an apocalyptic number.

It is an amenable number.

398426265 is a deficient number, since it is larger than the sum of its proper divisors (292179339).

398426265 is a wasteful number, since it uses less digits than its factorization.

398426265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8853928 (or 8853925 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 398426265 is about 19960.6178511588. The cubic root of 398426265 is about 735.8387481733.

The spelling of 398426265 in words is "three hundred ninety-eight million, four hundred twenty-six thousand, two hundred sixty-five".