1299990321 has 24 divisors (see below), whose sum is σ = 2198361984. Its totient is φ = 724731840.

The previous prime is 1299990299. The next prime is 1299990359. The reversal of 1299990321 is 1230999921.

It is not a de Polignac number, because 1299990321 - 2⁹ = 1299989809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1299990721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 249061 + ... + 254226.

It is an arithmetic number, because the mean of its divisors is an integer number (91598416).

Almost surely, 2^1299990321 is an apocalyptic number.

It is an amenable number.

1299990321 is a deficient number, since it is larger than the sum of its proper divisors (898371663).

1299990321 is a wasteful number, since it uses less digits than its factorization.

1299990321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503341 (or 503338 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 1299990321 is about 36055.3785308101. The cubic root of 1299990321 is about 1091.3901744411.

The spelling of 1299990321 in words is "one billion, two hundred ninety-nine million, nine hundred ninety thousand, three hundred twenty-one".