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661886 = 2330943
BaseRepresentation
bin10100001100101111110
31020121221022
42201211332
5132140021
622104142
75424461
oct2414576
91217838
10661886
11412315
1227b052
131a2364
141332d8
15d11ab
hexa197e

661886 has 4 divisors (see below), whose sum is σ = 992832. Its totient is φ = 330942.

The previous prime is 661883. The next prime is 661889. The reversal of 661886 is 688166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 688166 = 2344083.

It is an interprime number because it is at equal distance from previous prime (661883) and next prime (661889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661883) 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 as a sum of consecutive naturals, namely, 165470 + ... + 165473.

It is an arithmetic number, because the mean of its divisors is an integer number (248208).

2661886 is an apocalyptic number.

661886 is a deficient number, since it is larger than the sum of its proper divisors (330946).

661886 is a wasteful number, since it uses less digits than its factorization.

661886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330945.

The product of its digits is 13824, while the sum is 35.

The square root of 661886 is about 813.5637651715. The cubic root of 661886 is about 87.1487304880.

The spelling of 661886 in words is "six hundred sixty-one thousand, eight hundred eighty-six".

Divisors: 1 2 330943 661886