261942705 has 24 divisors (see below), whose sum is σ = 456331200. Its totient is φ = 138996000.

The previous prime is 261942697. The next prime is 261942743. The reversal of 261942705 is 507249162.

It is not a de Polignac number, because 261942705 - 2³ = 261942697 is a prime.

It is a super-2 number, since 2×261942705² = 137227961405434050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261942705.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5671 + ... + 23580.

It is an arithmetic number, because the mean of its divisors is an integer number (19013800).

Almost surely, 2^261942705 is an apocalyptic number.

It is an amenable number.

261942705 is a deficient number, since it is larger than the sum of its proper divisors (194388495).

261942705 is a wasteful number, since it uses less digits than its factorization.

261942705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29461 (or 29458 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 261942705 is about 16184.6441110084. The cubic root of 261942705 is about 639.8361437619.

The spelling of 261942705 in words is "two hundred sixty-one million, nine hundred forty-two thousand, seven hundred five".