1321185870 has 32 divisors (see below), whose sum is σ = 3523163040. Its totient is φ = 352316160.

The previous prime is 1321185863. The next prime is 1321185871. The reversal of 1321185870 is 785811231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321185871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2446371 + ... + 2446910.

It is an arithmetic number, because the mean of its divisors is an integer number (110098845).

Almost surely, 2^1321185870 is an apocalyptic number.

1321185870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321185870 is an abundant number, since it is smaller than the sum of its proper divisors (2201977170).

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

1321185870 is a wasteful number, since it uses less digits than its factorization.

1321185870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4893297 (or 4893291 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 1321185870 is about 36348.1205841513. The cubic root of 1321185870 is about 1097.2897105237.

The spelling of 1321185870 in words is "one billion, three hundred twenty-one million, one hundred eighty-five thousand, eight hundred seventy".