1321799740 has 12 divisors (see below), whose sum is σ = 2775779496. Its totient is φ = 528719888.

The previous prime is 1321799737. The next prime is 1321799767. The reversal of 1321799740 is 479971231.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33044974 + ... + 33045013.

It is an arithmetic number, because the mean of its divisors is an integer number (231314958).

Almost surely, 2^1321799740 is an apocalyptic number.

1321799740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321799740 is an abundant number, since it is smaller than the sum of its proper divisors (1453979756).

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

1321799740 is a wasteful number, since it uses less digits than its factorization.

1321799740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66089996 (or 66089994 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 1321799740 is about 36356.5639190504. The cubic root of 1321799740 is about 1097.4596308333.

The spelling of 1321799740 in words is "one billion, three hundred twenty-one million, seven hundred ninety-nine thousand, seven hundred forty".