1320899842 has 4 divisors (see below), whose sum is σ = 1981349766. Its totient is φ = 660449920.

The previous prime is 1320899803. The next prime is 1320899851. The reversal of 1320899842 is 2489980231.

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

It can be written as a sum of positive squares in only one way, i.e., 729486081 + 591413761 = 27009^2 + 24319^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1320899792 and 1320899801.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330224959 + ... + 330224962.

Almost surely, 2^1320899842 is an apocalyptic number.

1320899842 is a deficient number, since it is larger than the sum of its proper divisors (660449924).

1320899842 is an equidigital number, since it uses as much as digits as its factorization.

1320899842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660449923.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1320899842 is about 36344.1858073613. The cubic root of 1320899842 is about 1097.2105194877.

It can be divided in two parts, 13208 and 99842, that added together give a triangular number (113050 = T₄₇₅).

The spelling of 1320899842 in words is "one billion, three hundred twenty million, eight hundred ninety-nine thousand, eight hundred forty-two".