1287429086 has 4 divisors (see below), whose sum is σ = 1931143632. Its totient is φ = 643714542.

The previous prime is 1287429083. The next prime is 1287429119. The reversal of 1287429086 is 6809247821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1287429086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287429083) 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 as a sum of consecutive naturals, namely, 321857270 + ... + 321857273.

It is an arithmetic number, because the mean of its divisors is an integer number (482785908).

Almost surely, 2^1287429086 is an apocalyptic number.

1287429086 is a deficient number, since it is larger than the sum of its proper divisors (643714546).

1287429086 is an equidigital number, since it uses as much as digits as its factorization.

1287429086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643714545.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1287429086 is about 35880.7620599117. The cubic root of 1287429086 is about 1087.8635834722.

The spelling of 1287429086 in words is "one billion, two hundred eighty-seven million, four hundred twenty-nine thousand, eighty-six".