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7942105 = 57971993
BaseRepresentation
bin11110010010111111011001
3112221111112001
4132102333121
54013121410
6442121001
7124335553
oct36227731
915844461
107942105
114535026
1227b0161
131850c92
1410aa4d3
15a6d33a
hex792fd9

7942105 has 8 divisors (see below), whose sum is σ = 9547272. Its totient is φ = 6342528.

The previous prime is 7942097. The next prime is 7942117. The reversal of 7942105 is 5012497.

It is a happy number.

7942105 is a nontrivial binomial coefficient, being equal to C(3986, 2).

It can be written as a sum of positive squares in 4 ways, for example, as 1408969 + 6533136 = 1187^2 + 2556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7942105 - 23 = 7942097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2989 + ... + 4981.

It is an arithmetic number, because the mean of its divisors is an integer number (1193409).

Almost surely, 27942105 is an apocalyptic number.

7942105 is the 3985-th triangular number and also the 1993-rd hexagonal number.

7942105 is the 1329-th centered nonagonal number.

It is an amenable number.

7942105 is a deficient number, since it is larger than the sum of its proper divisors (1605167).

7942105 is a wasteful number, since it uses less digits than its factorization.

7942105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 7942105 is about 2818.1740542415. The cubic root of 7942105 is about 199.5163731346.

The spelling of 7942105 in words is "seven million, nine hundred forty-two thousand, one hundred five".

Divisors: 1 5 797 1993 3985 9965 1588421 7942105