261000042 has 32 divisors (see below), whose sum is σ = 531456000. Its totient is φ = 85436208.

The previous prime is 261000023. The next prime is 261000127. The reversal of 261000042 is 240000162.

It is a super-3 number, since 3×261000042³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 260999985 and 261000030.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92943 + ... + 95709.

It is an arithmetic number, because the mean of its divisors is an integer number (16608000).

Almost surely, 2^261000042 is an apocalyptic number.

261000042 is an abundant number, since it is smaller than the sum of its proper divisors (270455958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261000042 is a wasteful number, since it uses less digits than its factorization.

261000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050.

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

The square root of 261000042 is about 16155.4957212708. The cubic root of 261000042 is about 639.0676871194.

The spelling of 261000042 in words is "two hundred sixty-one million, forty-two", and thus it is an aban number.