1287430520 has 32 divisors (see below), whose sum is σ = 3022665120. Its totient is φ = 492581760.

The previous prime is 1287430493. The next prime is 1287430541. The reversal of 1287430520 is 250347821.

It is a congruent 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, 698771 + ... + 700610.

It is an arithmetic number, because the mean of its divisors is an integer number (94458285).

Almost surely, 2^1287430520 is an apocalyptic number.

1287430520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287430520 is an abundant number, since it is smaller than the sum of its proper divisors (1735234600).

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

1287430520 is a wasteful number, since it uses less digits than its factorization.

1287430520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399415 (or 1399411 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1287430520 is about 35880.7820427593. The cubic root of 1287430520 is about 1087.8639873769.

The spelling of 1287430520 in words is "one billion, two hundred eighty-seven million, four hundred thirty thousand, five hundred twenty".