1287672985 has 8 divisors (see below), whose sum is σ = 1551084480. Its totient is φ = 1026220464.

The previous prime is 1287672983. The next prime is 1287673021. The reversal of 1287672985 is 5892767821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287672985 - 2¹ = 1287672983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287672983) 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, 488295 + ... + 490924.

It is an arithmetic number, because the mean of its divisors is an integer number (193885560).

Almost surely, 2^1287672985 is an apocalyptic number.

It is an amenable number.

1287672985 is a deficient number, since it is larger than the sum of its proper divisors (263411495).

1287672985 is an equidigital number, since it uses as much as digits as its factorization.

1287672985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979487.

The product of its digits is 3386880, while the sum is 55.

The square root of 1287672985 is about 35884.1606422667. The cubic root of 1287672985 is about 1087.9322764691.

The spelling of 1287672985 in words is "one billion, two hundred eighty-seven million, six hundred seventy-two thousand, nine hundred eighty-five".