1338720 has 48 divisors (see below), whose sum is σ = 4218480. Its totient is φ = 356864.

The previous prime is 1338703. The next prime is 1338731. The reversal of 1338720 is 278331.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 915 + ... + 1874.

It is an arithmetic number, because the mean of its divisors is an integer number (87885).

2^1338720 is an apocalyptic number.

1338720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1338720 is an abundant number, since it is smaller than the sum of its proper divisors (2879760).

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

1338720 is a wasteful number, since it uses less digits than its factorization.

1338720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807 (or 2799 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1338720 is about 1157.0306823935. The cubic root of 1338720 is about 110.2122623193.

The spelling of 1338720 in words is "one million, three hundred thirty-eight thousand, seven hundred twenty".