42838261 has 2 divisors, whose sum is σ = 42838262. Its totient is φ = 42838260.

The previous prime is 42838231. The next prime is 42838273. The reversal of 42838261 is 16283824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 2579236 = 6345^2 + 1606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42838261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42838231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21419130 + 21419131.

It is an arithmetic number, because the mean of its divisors is an integer number (21419131).

Almost surely, 2^42838261 is an apocalyptic number.

It is an amenable number.

42838261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42838261 is an equidigital number, since it uses as much as digits as its factorization.

42838261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 42838261 is about 6545.0944225427. The cubic root of 42838261 is about 349.9000013640.

It can be divided in two parts, 4283 and 8261, that added together give a square (12544 = 112²).

The spelling of 42838261 in words is "forty-two million, eight hundred thirty-eight thousand, two hundred sixty-one".