1386720 has 120 divisors (see below), whose sum is σ = 4939704. Its totient is φ = 366336.

The previous prime is 1386703. The next prime is 1386731. The reversal of 1386720 is 276831.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12907 + ... + 13013.

2^1386720 is an apocalyptic number.

1386720 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 1386720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2469852).

1386720 is an abundant number, since it is smaller than the sum of its proper divisors (3552984).

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

1386720 is a wasteful number, since it uses less digits than its factorization.

1386720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1386720 is about 1177.5907608333. The cubic root of 1386720 is about 111.5140510623.

1386720 divided by its sum of digits (27) gives a triangular number (51360 = T₃₂₀).

The spelling of 1386720 in words is "one million, three hundred eighty-six thousand, seven hundred twenty".