1287873380 has 24 divisors (see below), whose sum is σ = 2706032448. Its totient is φ = 514863968.

The previous prime is 1287873359. The next prime is 1287873443. The reversal of 1287873380 is 833787821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21257 + ... + 55023.

It is an arithmetic number, because the mean of its divisors is an integer number (112751352).

Almost surely, 2^1287873380 is an apocalyptic number.

1287873380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287873380 is an abundant number, since it is smaller than the sum of its proper divisors (1418159068).

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

1287873380 is a wasteful number, since it uses less digits than its factorization.

1287873380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35683 (or 35681 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 1287873380 is about 35886.9527823135. The cubic root of 1287873380 is about 1087.9887102797.

The spelling of 1287873380 in words is "one billion, two hundred eighty-seven million, eight hundred seventy-three thousand, three hundred eighty".