1287669493 has 16 divisors (see below), whose sum is σ = 1441379520. Its totient is φ = 1140163200.

The previous prime is 1287669479. The next prime is 1287669497. The reversal of 1287669493 is 3949667821.

It is not a de Polignac number, because 1287669493 - 2⁹ = 1287668981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287669497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317746 + ... + 321772.

It is an arithmetic number, because the mean of its divisors is an integer number (90086220).

Almost surely, 2^1287669493 is an apocalyptic number.

It is an amenable number.

1287669493 is a deficient number, since it is larger than the sum of its proper divisors (153710027).

1287669493 is a wasteful number, since it uses less digits than its factorization.

1287669493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788.

The product of its digits is 3919104, while the sum is 55.

The square root of 1287669493 is about 35884.1119856685. Note that the first 3 decimals coincide. The cubic root of 1287669493 is about 1087.9312930251.

It can be divided in two parts, 12876 and 69493, that added together give a square (82369 = 287²).

The spelling of 1287669493 in words is "one billion, two hundred eighty-seven million, six hundred sixty-nine thousand, four hundred ninety-three".