1287046646 has 4 divisors (see below), whose sum is σ = 1930569972. Its totient is φ = 643523322.

The previous prime is 1287046601. The next prime is 1287046667. The reversal of 1287046646 is 6466407821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6466407821 = 1787 ⋅3618583.

It is a junction number, because it is equal to n+sod(n) for n = 1287046597 and 1287046606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321761660 + ... + 321761663.

It is an arithmetic number, because the mean of its divisors is an integer number (482642493).

Almost surely, 2^1287046646 is an apocalyptic number.

1287046646 is a deficient number, since it is larger than the sum of its proper divisors (643523326).

1287046646 is an equidigital number, since it uses as much as digits as its factorization.

1287046646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643523325.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 1287046646 is about 35875.4323458269. The cubic root of 1287046646 is about 1087.7558535899.

The spelling of 1287046646 in words is "one billion, two hundred eighty-seven million, forty-six thousand, six hundred forty-six".