1392720 has 80 divisors (see below), whose sum is σ = 4940160. Its totient is φ = 317952.

The previous prime is 1392707. The next prime is 1392731. The reversal of 1392720 is 272931.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is an Ulam number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (61752).

2^1392720 is an apocalyptic number.

1392720 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 1392720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2470080).

1392720 is an abundant number, since it is smaller than the sum of its proper divisors (3547440).

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

1392720 is a wasteful number, since it uses less digits than its factorization.

1392720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1392720 is about 1180.1355854308. The cubic root of 1392720 is about 111.6746510466.

It can be divided in two parts, 1392 and 720, that added together give a palindrome (2112).

The spelling of 1392720 in words is "one million, three hundred ninety-two thousand, seven hundred twenty".