1287985402 has 8 divisors (see below), whose sum is σ = 2107612512. Its totient is φ = 585447900.

The previous prime is 1287985397. The next prime is 1287985403. The reversal of 1287985402 is 2045897821.

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

It is not an unprimeable number, because it can be changed into a prime (1287985403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29272374 + ... + 29272417.

It is an arithmetic number, because the mean of its divisors is an integer number (263451564).

Almost surely, 2^1287985402 is an apocalyptic number.

1287985402 is a deficient number, since it is larger than the sum of its proper divisors (819627110).

1287985402 is a wasteful number, since it uses less digits than its factorization.

1287985402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58544804.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 1287985402 is about 35888.5135105928. The cubic root of 1287985402 is about 1088.0202545654.

It can be divided in two parts, 1287 and 985402, that added together give a palindrome (986689).

The spelling of 1287985402 in words is "one billion, two hundred eighty-seven million, nine hundred eighty-five thousand, four hundred two".