1287901916 has 48 divisors (see below), whose sum is σ = 2617681920. Its totient is φ = 543024000.

The previous prime is 1287901903. The next prime is 1287901921. The reversal of 1287901916 is 6191097821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1534625 + ... + 1535463.

It is an arithmetic number, because the mean of its divisors is an integer number (54535040).

Almost surely, 2^1287901916 is an apocalyptic number.

It is an amenable number.

1287901916 is an abundant number, since it is smaller than the sum of its proper divisors (1329780004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287901916 is a wasteful number, since it uses less digits than its factorization.

1287901916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 44.

The square root of 1287901916 is about 35887.3503619312. The cubic root of 1287901916 is about 1087.9967459083.

The spelling of 1287901916 in words is "one billion, two hundred eighty-seven million, nine hundred one thousand, nine hundred sixteen".