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23140643 = 106921647
BaseRepresentation
bin101100001000…
…1100100100011
31121112122222212
41120101210203
521411000033
62143552335
7400456301
oct130214443
947478885
1023140643
11120759a9
1278bb6ab
134a42ab6
143105271
152071748
hex1611923

23140643 has 4 divisors (see below), whose sum is σ = 23163360. Its totient is φ = 23117928.

The previous prime is 23140609. The next prime is 23140657. The reversal of 23140643 is 34604132.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 23140643 - 214 = 23124259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23140673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9755 + ... + 11892.

It is an arithmetic number, because the mean of its divisors is an integer number (5790840).

Almost surely, 223140643 is an apocalyptic number.

23140643 is a deficient number, since it is larger than the sum of its proper divisors (22717).

23140643 is a wasteful number, since it uses less digits than its factorization.

23140643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22716.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 23140643 is about 4810.4722221420. The cubic root of 23140643 is about 284.9651870887.

Adding to 23140643 its reverse (34604132), we get a palindrome (57744775).

The spelling of 23140643 in words is "twenty-three million, one hundred forty thousand, six hundred forty-three".

Divisors: 1 1069 21647 23140643