42840261 has 12 divisors (see below), whose sum is σ = 62494380. Its totient is φ = 28276800.

The previous prime is 42840253. The next prime is 42840263. The reversal of 42840261 is 16204824.

It can be written as a sum of positive squares in 2 ways, for example, as 17589636 + 25250625 = 4194^2 + 5025^2 .

It is not a de Polignac number, because 42840261 - 2³ = 42840253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42840263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22656 + ... + 24473.

It is an arithmetic number, because the mean of its divisors is an integer number (5207865).

Almost surely, 2^42840261 is an apocalyptic number.

It is an amenable number.

42840261 is a deficient number, since it is larger than the sum of its proper divisors (19654119).

42840261 is a wasteful number, since it uses less digits than its factorization.

42840261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47236 (or 47233 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 42840261 is about 6545.2472069434. The cubic root of 42840261 is about 349.9054465673.

The spelling of 42840261 in words is "forty-two million, eight hundred forty thousand, two hundred sixty-one".