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999997 = 7571321
BaseRepresentation
bin11110100001000111101
31212210201221
43310020331
5223444442
633233341
711333305
oct3641075
91783657
10999997
11623349
12402851
1329021b
141c0605
1514b467
hexf423d

999997 has 4 divisors (see below), whose sum is σ = 1002076. Its totient is φ = 997920.

The previous prime is 999983. The next prime is 1000003. The reversal of 999997 is 799999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 793881 + 206116 = 891^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997 - 211 = 997949 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999907) 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, 97 + ... + 1417.

It is an arithmetic number, because the mean of its divisors is an integer number (250519).

2999997 is an apocalyptic number.

It is an amenable number.

999997 is a deficient number, since it is larger than the sum of its proper divisors (2079).

999997 is a wasteful number, since it uses less digits than its factorization.

999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078.

The product of its digits is 413343, while the sum is 52.

The square root of 999997 is about 999.9984999989. The cubic root of 999997 is about 99.9998999999. Note that the first 3 decimals are identical.

The spelling of 999997 in words is "nine hundred ninety-nine thousand, nine hundred ninety-seven".

Divisors: 1 757 1321 999997