1287155706 has 16 divisors (see below), whose sum is σ = 2588695200. Its totient is φ = 426654608.

The previous prime is 1287155699. The next prime is 1287155729. The reversal of 1287155706 is 6075517821.

It is a super-2 number, since 2×1287155706² = 3313539622976716872, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 598161 + ... + 600308.

It is an arithmetic number, because the mean of its divisors is an integer number (161793450).

Almost surely, 2^1287155706 is an apocalyptic number.

1287155706 is an abundant number, since it is smaller than the sum of its proper divisors (1301539494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287155706 is a wasteful number, since it uses less digits than its factorization.

1287155706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198653.

The product of its (nonzero) digits is 117600, while the sum is 42.

The square root of 1287155706 is about 35876.9522953107. The cubic root of 1287155706 is about 1087.7865769785.

It can be divided in two parts, 128715 and 5706, that added together give a triangular number (134421 = T₅₁₈).

The spelling of 1287155706 in words is "one billion, two hundred eighty-seven million, one hundred fifty-five thousand, seven hundred six".