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1387887 = 3462629
BaseRepresentation
bin101010010110101101111
32121111211020
411102311233
5323403022
645425223
714540214
oct5226557
92544736
101387887
11868816
1256b213
13397947
14281b0b
151c635c
hex152d6f

1387887 has 4 divisors (see below), whose sum is σ = 1850520. Its totient is φ = 925256.

The previous prime is 1387879. The next prime is 1387913. The reversal of 1387887 is 7887831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1387887 - 23 = 1387879 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231312 + ... + 231317.

It is an arithmetic number, because the mean of its divisors is an integer number (462630).

21387887 is an apocalyptic number.

1387887 is a deficient number, since it is larger than the sum of its proper divisors (462633).

1387887 is an equidigital number, since it uses as much as digits as its factorization.

1387887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462632.

The product of its digits is 75264, while the sum is 42.

The square root of 1387887 is about 1178.0861598372. The cubic root of 1387887 is about 111.5453239962.

The spelling of 1387887 in words is "one million, three hundred eighty-seven thousand, eight hundred eighty-seven".

Divisors: 1 3 462629 1387887