1308720 has 160 divisors (see below), whose sum is σ = 4999680. Its totient is φ = 276480.

The previous prime is 1308719. The next prime is 1308731. The reversal of 1308720 is 278031.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31900 + ... + 31940.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2^1308720 is an apocalyptic number.

1308720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1308720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2499840).

1308720 is an abundant number, since it is smaller than the sum of its proper divisors (3690960).

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

1308720 is a wasteful number, since it uses less digits than its factorization.

1308720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1308720 is about 1143.9930069716. The cubic root of 1308720 is about 109.3827689720.

The spelling of 1308720 in words is "one million, three hundred eight thousand, seven hundred twenty".