40143289 has 2 divisors, whose sum is σ = 40143290. Its totient is φ = 40143288.

The previous prime is 40143287. The next prime is 40143317. The reversal of 40143289 is 98234104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24800400 + 15342889 = 4980^2 + 3917^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143289 - 2¹ = 40143287 is a prime.

It is a super-2 number, since 2×40143289² = 3222967303475042, which contains 22 as substring.

Together with 40143287, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40143289.

It is not a weakly prime, because it can be changed into another prime (40143287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20071644 + 20071645.

It is an arithmetic number, because the mean of its divisors is an integer number (20071645).

Almost surely, 2^40143289 is an apocalyptic number.

It is an amenable number.

40143289 is a deficient number, since it is larger than the sum of its proper divisors (1).

40143289 is an equidigital number, since it uses as much as digits as its factorization.

40143289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40143289 is about 6335.8731837056. The cubic root of 40143289 is about 342.4030705873.

The spelling of 40143289 in words is "forty million, one hundred forty-three thousand, two hundred eighty-nine".