1287274365 has 48 divisors (see below), whose sum is σ = 2407270320. Its totient is φ = 632586240.

The previous prime is 1287274337. The next prime is 1287274367. The reversal of 1287274365 is 5634727821.

1287274365 is a `hidden beast` number, since 1 + 287 + 2 + 7 + 4 + 365 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 34539129 + 1252735236 = 5877^2 + 35394^2 .

It is not a de Polignac number, because 1287274365 - 2⁷ = 1287274237 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1287274365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287274367) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 385021 + ... + 388349.

It is an arithmetic number, because the mean of its divisors is an integer number (50151465).

Almost surely, 2^1287274365 is an apocalyptic number.

1287274365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287274365 is a deficient number, since it is larger than the sum of its proper divisors (1119995955).

1287274365 is a wasteful number, since it uses less digits than its factorization.

1287274365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014 (or 4011 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1287274365 is about 35878.6059511793. The cubic root of 1287274365 is about 1087.8200025386.

The spelling of 1287274365 in words is "one billion, two hundred eighty-seven million, two hundred seventy-four thousand, three hundred sixty-five".