1387620 has 72 divisors (see below), whose sum is σ = 4540536. Its totient is φ = 340992.

The previous prime is 1387601. The next prime is 1387649. The reversal of 1387620 is 267831.

1387620 is a `hidden beast` number, since 1 + 38 + 7 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46656 + 1340964 = 216^2 + 1158^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2044 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (63063).

2^1387620 is an apocalyptic number.

1387620 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 1387620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270268).

1387620 is an abundant number, since it is smaller than the sum of its proper divisors (3152916).

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

1387620 is a wasteful number, since it uses less digits than its factorization.

1387620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 616 counting only the distinct ones).

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

The square root of 1387620 is about 1177.9728350009. The cubic root of 1387620 is about 111.5381705532.

The spelling of 1387620 in words is "one million, three hundred eighty-seven thousand, six hundred twenty".