1287639095 has 24 divisors (see below), whose sum is σ = 1615094640. Its totient is φ = 985353600.

The previous prime is 1287639079. The next prime is 1287639097. The reversal of 1287639095 is 5909367821.

It is not a de Polignac number, because 1287639095 - 2⁴ = 1287639079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287639097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426140 + ... + 429150.

It is an arithmetic number, because the mean of its divisors is an integer number (67295610).

Almost surely, 2^1287639095 is an apocalyptic number.

1287639095 is a deficient number, since it is larger than the sum of its proper divisors (327455545).

1287639095 is an equidigital number, since it uses as much as digits as its factorization.

1287639095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167 (or 3136 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 1287639095 is about 35883.6884252441. The cubic root of 1287639095 is about 1087.9227320303.

The spelling of 1287639095 in words is "one billion, two hundred eighty-seven million, six hundred thirty-nine thousand, ninety-five".