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42621 = 314207
BaseRepresentation
bin1010011001111101
32011110120
422121331
52330441
6525153
7235155
oct123175
964416
1042621
112a027
12207b9
1316527
1411765
15c966
hexa67d

42621 has 4 divisors (see below), whose sum is σ = 56832. Its totient is φ = 28412.

The previous prime is 42611. The next prime is 42641. The reversal of 42621 is 12624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42621 - 25 = 42589 is a prime.

It is a D-number.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 42621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42611) 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, 7101 + ... + 7106.

It is an arithmetic number, because the mean of its divisors is an integer number (14208).

242621 is an apocalyptic number.

It is an amenable number.

42621 is a deficient number, since it is larger than the sum of its proper divisors (14211).

42621 is a wasteful number, since it uses less digits than its factorization.

42621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14210.

The product of its digits is 96, while the sum is 15.

The square root of 42621 is about 206.4485408038. The cubic root of 42621 is about 34.9307474178.

The spelling of 42621 in words is "forty-two thousand, six hundred twenty-one".

Divisors: 1 3 14207 42621