1299939220 has 12 divisors (see below), whose sum is σ = 2729872404. Its totient is φ = 519975680.

The previous prime is 1299939209. The next prime is 1299939257. The reversal of 1299939220 is 229399921.

It can be written as a sum of positive squares in 2 ways, for example, as 237961476 + 1061977744 = 15426^2 + 32588^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32498461 + ... + 32498500.

It is an arithmetic number, because the mean of its divisors is an integer number (227489367).

Almost surely, 2^1299939220 is an apocalyptic number.

1299939220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299939220 is an abundant number, since it is smaller than the sum of its proper divisors (1429933184).

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

1299939220 is a wasteful number, since it uses less digits than its factorization.

1299939220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64996970 (or 64996968 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 1299939220 is about 36054.6698778397. The cubic root of 1299939220 is about 1091.3758738577.

The spelling of 1299939220 in words is "one billion, two hundred ninety-nine million, nine hundred thirty-nine thousand, two hundred twenty".