1287378099 has 24 divisors (see below), whose sum is σ = 2160041312. Its totient is φ = 723582720.

The previous prime is 1287378073. The next prime is 1287378119. The reversal of 1287378099 is 9908737821.

It is not a de Polignac number, because 1287378099 - 2⁸ = 1287377843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287378899) 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, 163654 + ... + 171339.

Almost surely, 2^1287378099 is an apocalyptic number.

1287378099 is a deficient number, since it is larger than the sum of its proper divisors (872663213).

1287378099 is a wasteful number, since it uses less digits than its factorization.

1287378099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335067 (or 335064 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 1287378099 is about 35880.0515467857. The cubic root of 1287378099 is about 1087.8492221290.

The spelling of 1287378099 in words is "one billion, two hundred eighty-seven million, three hundred seventy-eight thousand, ninety-nine".