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2640023 is a prime number
BaseRepresentation
bin1010000100100010010111
311222010102122
422010202113
51133440043
6132330155
731303601
oct12044227
94863378
102640023
111543541
12a7395b
13715859
144ca171
15372368
hex284897

2640023 has 2 divisors, whose sum is σ = 2640024. Its totient is φ = 2640022.

The previous prime is 2640017. The next prime is 2640041. The reversal of 2640023 is 3200462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2640023 - 214 = 2623639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2639983 and 2640010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320011 + 1320012.

It is an arithmetic number, because the mean of its divisors is an integer number (1320012).

22640023 is an apocalyptic number.

2640023 is the 869-th centered heptagonal number.

2640023 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640023 is an equidigital number, since it uses as much as digits as its factorization.

2640023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 2640023 is about 1624.8147586725. The cubic root of 2640023 is about 138.2088659620.

Adding to 2640023 its reverse (3200462), we get a palindrome (5840485).

The spelling of 2640023 in words is "two million, six hundred forty thousand, twenty-three".