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1387644 = 223115637
BaseRepresentation
bin101010010110001111100
32121111111020
411102301330
5323401034
645424140
714536416
oct5226174
92544436
101387644
11868615
1256b050
133977bb
142819b6
151c6249
hex152c7c

1387644 has 12 divisors (see below), whose sum is σ = 3237864. Its totient is φ = 462544.

The previous prime is 1387601. The next prime is 1387649. The reversal of 1387644 is 4467831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57807 + ... + 57830.

It is an arithmetic number, because the mean of its divisors is an integer number (269822).

21387644 is an apocalyptic number.

It is an amenable number.

1387644 is an abundant number, since it is smaller than the sum of its proper divisors (1850220).

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

1387644 is a wasteful number, since it uses less digits than its factorization.

1387644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115644 (or 115642 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 1387644 is about 1177.9830219490. The cubic root of 1387644 is about 111.5388135969.

The spelling of 1387644 in words is "one million, three hundred eighty-seven thousand, six hundred forty-four".

Divisors: 1 2 3 4 6 12 115637 231274 346911 462548 693822 1387644