400000289 has 8 divisors (see below), whose sum is σ = 430955112. Its totient is φ = 369072000.

The previous prime is 400000283. The next prime is 400000301. The reversal of 400000289 is 982000004.

It can be written as a sum of positive squares in 4 ways, for example, as 289 + 400000000 = 17^2 + 20000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400000289 - 2²⁴ = 383223073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400000283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33887 + ... + 44139.

It is an arithmetic number, because the mean of its divisors is an integer number (53869389).

Almost surely, 2^400000289 is an apocalyptic number.

It is an amenable number.

400000289 is a deficient number, since it is larger than the sum of its proper divisors (30954823).

400000289 is a wasteful number, since it uses less digits than its factorization.

400000289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13267.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 400000289 is about 20000.0072249987. The cubic root of 400000289 is about 736.8064771756.

The spelling of 400000289 in words is "four hundred million, two hundred eighty-nine", and thus it is an aban number.