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1027981 = 672229
BaseRepresentation
bin11111010111110001101
31221020010101
43322332031
5230343411
634011101
711511013
oct3727615
91836111
101027981
11642379
12416a91
1329cb96
141ca8b3
151548c1
hexfaf8d

1027981 has 6 divisors (see below), whose sum is σ = 1048110. Its totient is φ = 1008216.

The previous prime is 1027969. The next prime is 1027987. The reversal of 1027981 is 1897201.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 17956 = 1005^2 + 134^2 .

It is not a de Polignac number, because 1027981 - 27 = 1027853 is a prime.

It is a super-2 number, since 2×10279812 = 2113489872722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1027987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4375 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (174685).

21027981 is an apocalyptic number.

It is an amenable number.

1027981 is a deficient number, since it is larger than the sum of its proper divisors (20129).

1027981 is an frugal number, since it uses more digits than its factorization.

1027981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1027981 is about 1013.8939786782. The cubic root of 1027981 is about 100.9241334657.

The spelling of 1027981 in words is "one million, twenty-seven thousand, nine hundred eighty-one".

Divisors: 1 67 229 4489 15343 1027981