1287940461 has 8 divisors (see below), whose sum is σ = 1721334624. Its totient is φ = 856586640.

The previous prime is 1287940447. The next prime is 1287940463. The reversal of 1287940461 is 1640497821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1287940461 - 2¹¹ = 1287938413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287940463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508611 + ... + 511136.

It is an arithmetic number, because the mean of its divisors is an integer number (215166828).

Almost surely, 2^1287940461 is an apocalyptic number.

It is an amenable number.

1287940461 is a deficient number, since it is larger than the sum of its proper divisors (433394163).

1287940461 is a wasteful number, since it uses less digits than its factorization.

1287940461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020171.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1287940461 is about 35887.8873855790. The cubic root of 1287940461 is about 1088.0075998446.

The spelling of 1287940461 in words is "one billion, two hundred eighty-seven million, nine hundred forty thousand, four hundred sixty-one".