1299945984 has 80 divisors (see below), whose sum is σ = 3470670720. Its totient is φ = 432373760.

The previous prime is 1299945973. The next prime is 1299945991. The reversal of 1299945984 is 4895499921.

It is a super-2 number, since 2×1299945984² = 3379719122635456512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1398832 + ... + 1399760.

It is an arithmetic number, because the mean of its divisors is an integer number (43383384).

Almost surely, 2^1299945984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1299945984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1735335360).

1299945984 is an abundant number, since it is smaller than the sum of its proper divisors (2170724736).

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

1299945984 is an frugal number, since it uses more digits than its factorization.

1299945984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1845 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 60.

The square root of 1299945984 is about 36054.7636797137. The cubic root of 1299945984 is about 1091.3777667805.

The spelling of 1299945984 in words is "one billion, two hundred ninety-nine million, nine hundred forty-five thousand, nine hundred eighty-four".