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1386820 = 22569341
BaseRepresentation
bin101010010100101000100
32121110100201
411102211010
5323334240
645420244
714534131
oct5224504
92543321
101386820
11867a36
1256a684
13397306
14281588
151c5d9a
hex152944

1386820 has 12 divisors (see below), whose sum is σ = 2912364. Its totient is φ = 554720.

The previous prime is 1386811. The next prime is 1386821. The reversal of 1386820 is 286831.

It can be written as a sum of positive squares in 2 ways, for example, as 430336 + 956484 = 656^2 + 978^2 .

It is not an unprimeable number, because it can be changed into a prime (1386821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34651 + ... + 34690.

It is an arithmetic number, because the mean of its divisors is an integer number (242697).

21386820 is an apocalyptic number.

1386820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1386820 is an abundant number, since it is smaller than the sum of its proper divisors (1525544).

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

1386820 is a wasteful number, since it uses less digits than its factorization.

1386820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69350 (or 69348 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1386820 is about 1177.6332196401. The cubic root of 1386820 is about 111.5167315210.

The spelling of 1386820 in words is "one million, three hundred eighty-six thousand, eight hundred twenty".

Divisors: 1 2 4 5 10 20 69341 138682 277364 346705 693410 1386820