1287393211 has 8 divisors (see below), whose sum is σ = 1418666480. Its totient is φ = 1160726112.

The previous prime is 1287393137. The next prime is 1287393271. The reversal of 1287393211 is 1123937821.

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

It is not a de Polignac number, because 1287393211 - 2¹¹ = 1287391163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287393271) 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, 1150956 + ... + 1152073.

It is an arithmetic number, because the mean of its divisors is an integer number (177333310).

Almost surely, 2^1287393211 is an apocalyptic number.

1287393211 is a deficient number, since it is larger than the sum of its proper divisors (131273269).

1287393211 is a wasteful number, since it uses less digits than its factorization.

1287393211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303085.

The product of its digits is 18144, while the sum is 37.

The square root of 1287393211 is about 35880.2621367236. The cubic root of 1287393211 is about 1087.8534787167.

The spelling of 1287393211 in words is "one billion, two hundred eighty-seven million, three hundred ninety-three thousand, two hundred eleven".