1308992 has 28 divisors (see below), whose sum is σ = 2634996. Its totient is φ = 645120.

The previous prime is 1308977. The next prime is 1309013. The reversal of 1308992 is 2998031.

It can be written as a sum of positive squares in 2 ways, for example, as 18496 + 1290496 = 136^2 + 1136^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 7142 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (94107).

2^1308992 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 1308992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317498).

1308992 is an abundant number, since it is smaller than the sum of its proper divisors (1326004).

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

1308992 is a wasteful number, since it uses less digits than its factorization.

1308992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1308992 is about 1144.1118826409. Note that the first 3 decimals coincide. The cubic root of 1308992 is about 109.3903463637.

The spelling of 1308992 in words is "one million, three hundred eight thousand, nine hundred ninety-two".