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42938921 is a prime number
BaseRepresentation
bin1010001111001…
…1001000101001
32222210112010102
42203303020221
541443021141
64132155145
71030655234
oct243631051
988715112
1042938921
1122268713
1212468ab5
138b8545c
1459ba41b
153b8299b
hex28f3229

42938921 has 2 divisors, whose sum is σ = 42938922. Its totient is φ = 42938920.

The previous prime is 42938899. The next prime is 42938933. The reversal of 42938921 is 12983924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41783296 + 1155625 = 6464^2 + 1075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-42938921 is a prime.

It is not a weakly prime, because it can be changed into another prime (42938941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21469460 + 21469461.

It is an arithmetic number, because the mean of its divisors is an integer number (21469461).

Almost surely, 242938921 is an apocalyptic number.

It is an amenable number.

42938921 is a deficient number, since it is larger than the sum of its proper divisors (1).

42938921 is an equidigital number, since it uses as much as digits as its factorization.

42938921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 42938921 is about 6552.7796392066. The cubic root of 42938921 is about 350.1738483275.

The spelling of 42938921 in words is "forty-two million, nine hundred thirty-eight thousand, nine hundred twenty-one".