1202821987 has 4 divisors (see below), whose sum is σ = 1203203296. Its totient is φ = 1202440680.

The previous prime is 1202821981. The next prime is 1202821993. The reversal of 1202821987 is 7891282021.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1202821981) and next prime (1202821993).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1202821987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1202821981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185883 + ... + 192244.

It is an arithmetic number, because the mean of its divisors is an integer number (300800824).

Almost surely, 2^1202821987 is an apocalyptic number.

1202821987 is a deficient number, since it is larger than the sum of its proper divisors (381309).

1202821987 is an equidigital number, since it uses as much as digits as its factorization.

1202821987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381308.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1202821987 is about 34681.7241065089. The cubic root of 1202821987 is about 1063.4909194637.

The spelling of 1202821987 in words is "one billion, two hundred two million, eight hundred twenty-one thousand, nine hundred eighty-seven".